Nero wrote:And this is not Old English, I think it's Early Modern English (or Shakespearan). Can someone confirm?
þu / ðu (thu) was the second person singular in Old english.
Somewhere in time it went to "thou" and then to "you"
Well, "thou" didn't transform into "you." It was simply replaced by "you" (except it wasn't replaced in those few dialects that still use "thou" or "tha"). "You" is not related to "thou," being from Old English "eow" which was from Proto Germanic *iuwiz, ultimately from PIE *ju.
einhar wrote:Another name for Freyr is Inguz or Ing.
Is England derived from this god Ing?
As Psi said, "English" derives from the term for "language of the Angles." "England" is from "Anglaland" (land of the Angles) but due to regular umlaut the /ɑ/ went to [ɛ] due to the following inflection. This explains the vowel difference between the "Angles" and the language they spoke, "Englisc," pronounced [ˈɛŋglɪʃ] in Old English.
Nendûr wrote:i had never thought about it from þu / ðu => Thou it just sounded more similar to they
Yes "thou" is actually a very old form, going back directly to Proto Indo European *tu (look at related forms in daughter IE languages: Latin tu, Irish tu, Welsh ti, Greek su, Lith. tu, O.C.S. ty, Skt. twa-m).
Regular sound changes from PIE /t/ > /θ/ produced Proto Germanic */θu/. PG */θu:/ then often became voiced due to a sandhi process, yielding /ðu:/ in many Germanic languages (most of which later hardened it to /du/ but a few languages like English and Icelandic have remained conservative in retaining the historical interdental fricatives). The Great Vowel Shift gets to take credit for the most recent change upon Old English /ðu:/, producing regular /ðaʊ/ in Modern English. Thus we have:
PIE */tu/ > PG */θu:/ > OE /ðu:/ > ME /ðaʊ/