You
You (/ju/) is the second-person personal pronoun (subject case) in Modern English.
Template:Modern English personal pronouns (table)
Etymology
You is derived from Old English ge or ȝe (both pronounced roughly like Modern English yea), which was the old nominative case form of the pronoun, and eow, which was the old accusative case form of the pronoun. In Middle English the nominative case became ye, and the oblique case (formed by the merger of the accusative case and the former dative case) was you. In early Modern English either the nominative or the accusative forms have been generalized in most dialects. Most generalized you; some dialects in the north of England and Scotland generalized ye, or use ye as a clipped or clitic form of the pronoun.
Ye and you are cognate with Dutch jij and jou, German ihr, Gothic jus and Old Norse ér. (Modern Icelandic þér is a variant form due to alteration of phrases like háfiþ ér (you have) into háfi þér etc.) The specific form of this pronoun is unique to the Germanic languages, but the Germanic forms ultimately do relate to the general Indo-European forms represented by Latin vos.
Note that in the early days of the printing press, the letter y was used in place of the thorn (þ), so many modern instances of ye (such as in "Ye Olde Shoppe") are in fact examples of the and not of you.
Plural forms in other European languages
Similar to English, u in Dutch is taken as a polite form for both plural and singular, while jij (singular) and jullie (plural) are considered informal. (Dutch lost its original thou form, du, just like English did; the forms U, jij, and jullie are more analogous to English you, ye, and y'all respectively). However, Dutch society traditionally values equality, making the use of u come across as somewhat distant and uncomfortable. French has kept the system intact. Vous is still used as formal and plural, while tu is used for informal singular. Russian uses this system also: vy (вы) is formal/plural and ty (ты) is informal singular. This kind of system is also found in other languages, like Finnish and Swedish. In modern Swedish though, the term ni (plural for you) is rarely used to address a single person, not even in formal circumstances. The term used is du (you, singular).
While English, Dutch, French and Russian use or have used the plural forms as the polite forms, other European languages use forms deriving from the third person. German, for example, uses the third person plural pronoun sie, capitalized Sie, as its formal pronoun (in other words, Sie is grammatically identical to They). Danish and Norwegian languages similarly use De. Italian has separate forms for singular (Lei) and plural (Loro), which are derived from the Italian words for she and they respectively; a partial similarity to the German system (especially since the German word for she is also sie, but conjugates differently from Sie). However, sometimes the French system is also used in Italy, using the plural pronoun voi as singular. In Hungarian, te is informal, while there are different, synonymous words for formal (ön and maga being the two most commonly used).
Spanish and Portuguese use pronouns derived from third person phrases which originally meant your mercy, sir or madam, along with their plural forms. For Spanish, they are usted (pl. ustedes), and for Portuguese, você (pl. vocês), o senhor (pl. os senhores) and a senhora (pl. as senhoras). Você is often employed informally in Brazil, though the original singular pronoun tu is more commonly used in the South, the Northeast and some rural regions (this may be due to foreign influence in some locations), but o senhor, a senhora and their plurals are still used and always formal. In some Spanish speaking areas (especially in Latin America), the original second person singular pronoun tú has been dropped entirely, thus erasing the distinction between formal and informal address. In others, it was replaced with an old form of the second person plural pronoun, vos, now used as an informal counterpart to usted. See voseo. Modified versions of vos, vosotros and vosotras, are still used in Spain as informal second person plural pronouns, while the singular there is still tú, used informally. Portuguese has moved farther away from the original paradigm; the plural pronoun vós has disappeared in Brazil and is no longer used in ordinary speech in Portugal.