Words related to your
Old English ge, nominative plural of 2nd person pronoun þu (see thou); cognate with Old Frisian ji, Old Saxon gi, Middle Dutch ghi, Dutch gij. Cognate with Lithuanian jūs, Sanskrit yuyam, Avestan yuzem, Greek hymeis.
Altered, by influence of we, from an earlier form that was similar to Gothic jus "you (plural)" (see you). The -r- in Old Norse er, German ihr probably is likewise from influence of their respective 1st person plural pronouns (Old Norse ver, German wir).
Old English eow, dative and accusative plural of þu (see thou), objective case of ge, "ye" (see ye), from Proto-Germanic *juz-, *iwwiz (source also of Old Norse yor, Old Saxon iu, Old Frisian iuwe, Middle Dutch, Dutch u, Old High German iu, iuwih, German euch), from PIE *yu, second person (plural) pronoun.
Pronunciation of you and the nominative form ye gradually merged from 14c.; the distinction between them passed out of general usage by 1600. Widespread use of French in England after 12c. gave English you the same association as French vous, and it began to drive out singular nominative thou, originally as a sign of respect (similar to the "royal we") when addressing superiors, then equals and strangers, and ultimately (by c. 1575) becoming the general form of address. Through 13c. English also retained a dual pronoun ink "you two; your two selves; each other."
absolutive form of your, c. 1300, on model of his, ours, etc. Yours truly "myself" is from 1833, from the common subscription of letters.
It is difficult to say what will succeed, and still more to pronounce what will not. I am at this moment in that uncertainty (on our own score,) and it is no small proof of the author's powers to be able to charm and fix a mind's attention on similar subjects and climates in such a predicament. That he may have the same effect upon all his readers is very sincerely the wish, and hardly the doubt, of yours truly,
[Lord Byron to John Murray, Dec. 4, 1813]