What are the PIE etymologies of German personal pronouns?

Question

As far as I know, there are some cognates about German and English personal pronouns, such as:

G "ich" and E "I",

G "du" and E "thou",

G "wir" and E "we",

G "ihr"(you pl.) and E "ye".

But I am confused with G "sie"(she, they) and "ihr"(her, their), because each word contains more than one meaning, and the cognates in English is unknown at least to me.

I just want someone help me with the PIE etymology of G "sie" and G "ihr".

Answer 1

Sie

Unlike the English "they" there is no Old Norse influence (þeir) in the ethymology of "sie". It is believed that it comes from Old Saxonian/Old High German thiu or siu thus not sharing a clear cut common ethymology. This is probably different for the same spelt demonstrative pronoun "sie" that may share a same etymology with the English she.

Ihr

The situation is little different with "ihr" that shares a common etymology with Old Saxonian gī̌ that became gē̌ in Old English when used as personal pronoun plural. However today ihr is also used as a possesive pronoun derived from Old High German ira wheras the English analogon "their" again has its roots in Old Norse þeir.