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The Huwala (also spelled: howala, howila, huwalah) (Arabic: الهولة) meaning "Those that have changed or moved". Originally the "Huwala" word is Arabic, but since Persian does not contain the pharyngeal fricative "ح" present in Arabic, it pronounced it Huwala. Huwala are the descendants of Sunni Arabs who moved from the Arabian Peninsula to Iran, when it was ruled by Arabs, and the word is also mistakenly used to call Sunni Persians who migrated from Persia, or Iran to the Arabian peninsula. The Huwala are much different from the Sunni Persians who also have migrated from their "Original" Homeland "Persia" to Arabia. Except that the two ethnicity share the same Islamic Sunni faith. The Huwala were groups of Sunni Arabs who migrated from the Eastern coast of the Arabian peninsula and Oman in the seventeenth and eighteenth centuries to the Iranian side of the Persian Gulf.
Terminology and origins 
The word Huwala (Arabic: الهولة) or (Arabic: حولة - متحولين) also means those who have moved from one location to another. However the Huwala naming was meant mainly for the Arabs who lived in parts of current day Iran when those parts were ruled by Arabs. Such parts includes the majority of Iranian islands and portions of the coast all the way from the north to the south excluding the Arabian Sea coast, which is mainly inhabited by Beluch tribes. Arab ruling of these parts started with Omar ibn al-Khattab (second Khalif after Mohammed) commanded for his armies to invade Persia from the sea with help of the Oman navy at that time which was mainly constituted of Azd tribes. Later ruling was carried by an Adnani Arabic tribe of Al Qawasim after taking over the east coast. Al Busaeed during handful of years from Al Marazeq state in Iran mainland, AlMaean ruling in Qishem island before arrival of Qwasim etc. Arabs are clearly distinguished by their long sequence names of Arabic origin (self, father, grandfather, great grandfather, .......etc., tribe).
Some other Arabs left the Arabian peninsula to Iran for hunting and vacations as well as doing business because of the proximity of the Persian coast. And this journey began since the arrival of Islam in Persia. It may be suggested that they were heading for Iran for some religious intentions, such as teaching the Qur'an and the Sunni faith, while other argue they moved there to have a better life from the desert, however those facts are unclear.
Of the Arabs that were moving to Iran, some actually turned to be businessmen while some had a better life and settled in Iran for decades, others were left there since the arrival of Islam and the victory over the Persian Empire. They went to live in some Persian ports like Bandar Lengeh and Bandar Charak, both of them were ports in the south east coast of Iran, in Hormozgan Province, indeed those Arabs there were Persianized as some may suggest since those ports were consisting of a mix of races, hence many of them had huge influence from the Persian culture and language.
However, after some Persians sought moving from Iran to the Arabian peninsula due to many different reasons such as job opportunities and pearl diving as well as business, many Persians (both Shia and Sunni) moved to the GCC countries at the time, but the confusing issue was the true identity of the Sunni Persians and Huwala. However both of them were favored by the Arab rulers of the Arabian peninsula since they had the same Sunni faith, but obviously the most one whom were favored were the original Huwala Arabs themselves.
Huwala Tribes 
The original Huwala tribes that left Arabia to Iran were mainly from the Bani Tamim, Bani Malek, Bani Aubaidel, Al Manaser, Al Haram, Al- Nesor, Bani Bushor and Al Marazeeq tribes. Many of these tribes had moved to the now known as GCC coastal regions during the Tea trade from the 17th through the 19th century. For example, in a dated record about the arrival of the Al-Khalifa tribe in Bahrain, it states that the city of Manama was under the control of “the Bani Huwala” (a general term used in the Arabic memoir or a coalition of tribes instead of one or another). The "Bani Huwala" then surrendered the city to the Al-Khalifa family in 1783. The strongest evidence of Huwala presence in the Bahrain was that the Al Jaboor who are the tribe with the most power and written history of the Huwalas, were ruling the Shia population of Bahrain when they were finally defeated by the Portuguese in 1521. Though the Sunni Persian empire of the time had aided the tribe to control the island at the time, the Portuguese were able to keep Iranian control away from the country for the while they remained.
The most recent influx of Huwala to the now known as GCC countries is during the 1960s. Iran under the Shah was strict regarding different ethnic groups and maintained censuses on them. Arabs especially were kept on a close watch. Most of the Arabian tribes were exiled from various ports and villages of Iran. One inviting country was Bahrain, which had a need for more Sunni Muslims as the country was mainly Shia and was ruled by a Sunni family that came from Saudi Arabia. It was also a country that had a fairly large Huwala community that existed on the island beforehand. Though there was a difference between the variety of people that had come during different times, the term “huwala” began to be used generally for all Sunni Muslims that had connections with Iran, especially after the Iranian Revolution, which brought about anti-shia tensions to the GCC nation states, uniting those that were Sunni. You will mainly hear this term used in Bahrain, though Oman and the UAE has a large number of these families living amongst them.
List of Arabian tribes who lived in some places in Persia:
- Al Ali
- Al S'aie Family.
- Al 'Abadela tribe.
- Al Hamad tribe.
- Al Jaboor tribe. Parts of this tribe became known as Al Nassour Tribe. They originated in Saudi Arabia and then went on to rule Bahrain before moving to Persia. In Persia, the Al Nassour became the ruling family of Kangaan in the province of Bushehr; however, after the Islamic Revolution they moved to and are currently living in Abu-Dhabi, UAE. Their last sheikh was Sheikh Soleiman Bin Hatam Al-Nassour, grandson of Shaikh Jabbara (Ruler of Bahrain - please see external links below). They have had and still hold close ties with the current Bahraini ruling family too.
- Al Matareesh tribe.
- Al 'Abadi tribe.
- Al Haram tribe.
- Al Ansari tribe (some of them are original Arabs while the other are Persians).
- Al Ka'abi tribe (Khuzestan of Iran).
- Al Marzooqi tribe (Independent state on the shore).
- Al Bosaidi Tribe (ruled Qishm Island for short periods when it was acquired from Al Qawasims).
- Al Mora tribe (Morah Island).
- Al Bosmait (Bandar Lengeh).
- Al Jaber family
- Al Jaidah Family
- Al Hermi Family
Other prominent Sunni Persian families in Arab States of the Persian Gulf who are usually categorized as Huwala include:
- Kooheji family from Kohej
- Janahi family from Jenah
- Khonji family of Khonj
- Bastaki family of Bastak
- Fekri family (also spelled as Fikree)
- Al Awadhi family of Evaz
- Abbasi family (see also House of Al Khan)
- Zainal family from Karmostaj
- Foolath family
- Galadari family of Galadar
- Bucheeri or Bucheery from Buchir
Ethnicity confusion with Persians 
Ironically, some people still think that all of the Sunni Persians in Iran are from Arabian descent, thanks to the arrival of the Huwala and Sunni Persians to Arabia.
Iran still has some big cities which include Sunni Muslims, besides Bandar Lengeh and Bandar Charak there is Ahvaz near the Iraqi border and Mashhad except that the latter two cities didn't have the Huwala who only travelled to the west coast of Persia, Ahvaz especially had and still has Arabs from Iraq. There are still Sunni mosques in both Bandar Lengeh and Bandar Charak.
The other groups who arrived to Arabia were original Sunni Persians. Their villages are many and can still be located mostly in the Fars Province as well as Hormozgan Province. And these locations obviously still has Sunni mosques up until now. In later years some of the those Sunni Persians left Iran to the GCC countries to work or to make Business, many of them moved to the GCC countries in the same period when the Arabian Huwala tribes were exiled from Iran, thus creating a confusing issue of how to distinguish between Persians and Arabs, since both had the same faith and Persian language as well as influence.
Of the reasons Sunni Persians left for the Arabian peninsula, was that most had the anti-religious pressure of Iran's former king Muhammad Reza Shah. The Shah forced everyone to accept his liberal ideas or what he called it the White Revolution, and he disliked religious people from both faiths.
Under his father, Reza Shah, women were ordered to lose the scarves. This led many to leave Persia, both Shia and Sunni Persians, not only to the Arabian peninsula, but to other parts of the world too. But because the GCC countries were the nearest point, it was the Persians first choice to leave for. It had also many job opportunities by that time so they could start a new life. One of the famous people to leave Iran in that period too, was Iran's former leader Ruhollah Khomeini who was opposing the White Revolution by that time, which meant that both Sunni and Shia Muslims were facing exile due to the Shah's regime.
Until recently, Iran official census still shows such coastal areas as mostly populated by Arabic ethnic people which confirms origins of Huwala that migrated back to Arabia are Arabs since they lived in same areas. This however is useful to distinguish between sunni Persians and Sunni Arabs in Iran.
Many of the other Sunni Persians, or at least most of them, claimed to be Huwala or "originally Arabs" too. The reason was that at the beginning of their arrival to the Persian Gulf countries, they weren't accepted that much, and were to many foreigners, or as what the Arab call them "Ajams" (Arabic: عجم) which means in Arabic a foreigner or who didn't speak Arabic.
Most of the Huwala families lived in the urban centres of the Gulf states and established themselves as trading business families, making use of their networks across the Gulf. In the Bahraini city of Manama, many settled in the neighbourhood of Awadhiya. They speak a dialect of Persian sometimes referred to as Khodmoni. However today, many Huwala families have become "Arabized" such that relatively few of them speak Persian, or even retain a separate identity. Traditionally, the Huwala have practiced the Shafi`i school of jurisprudence when it comes to Islamic rites, in contrast to the Maliki school practiced by most of the tribal Arabs of the Gulf centres. Mahyawa is a fish sauce is that is regarded as being an essential item of Huwala cuisine.