Lechia is the historical and/or alternative name of Poland, stemming from the word Lech (which is also a common first name). It is still present in several European languages and some languages of Central Asia and the Middle East:
- Lenkija in the Lithuanian language
- Lengyelország in the Hungarian language
- Lehastan in the Armenian language,
- Lehistan in the Ottoman Turkish language
- Lahestan/Lehestan in Persian.
- Lehia in the Romanian language
Several Polish sports organizations are named Lechia. The best known example is Lechia Gdansk. Other examples are Lechia Lwow, Lechia Dzierzoniow, Lechia Zielona Gora and Lechia Tomaszow Mazowiecki. In People's Republic of Poland, the Nivea branch located in Poznan was named Cosmetics Factory Pollena-Lechia (Fabryka Kosmetyków Pollena-Lechia).
- "Laesir is the Old Norse term for the Ljachar, a people near the Vistula in Poland". [in:] Theodore Murdock Andersson, Kari Ellen Gade Morkinskinna : The Earliest Icelandic Chronicle of the Norwegian Kings (1030-1157). ISBN 978-0-8014-3694-9 p. 471; "The word here for Poles is "Laesum" – the dative plural from a nominative plural "Laesir". This clearly is derived from the old name for Pole – "Lyakh", since in the course of the Slavonic paradigm -kh- becomes -s-in accordance with the "second palatalization" and the addition of the regular Norse plural ending of -ir- [...] [in:] The Ukrainian review. 1963. p. 70; "eastern Wends, meaning obviously the Vjatyci/Radimici, Laesir "Poles" or "Western Slavs" (ef. Old Rus'ian ljaxy) [in:] Omeljan Pritsak. Old Scandinavian sources other than the sagas. 1981. p. 300
- (Polish) W. Chrzanowski. Kronika Słowian: Polanie. Vol. 2. Libron. 2006. p. 73.