If they are cognates,what happened to the mophological changes on them historically?Such as the emergence of "h" in "she"? she mid-12c., probably evolving from O.E. seo, sio (acc. sie), fem. of ...
What is the origin of the personal pronouns I, you, he, she, it, we, and they?
From the top of my head, Danish "de" (practically never used), German "Sie", Chinese "您", French "vous", Spanish "usted" are a formal way of addressing someone, especially if one isn't familiar with ...