the russian word tzar, is related to the german kaiser, which comes from the roman Caeser...

Its often hard for us language illiterated to see the connections, especially when words have move from the greek, or into russian or any other language that uses a different alphabet, but the sounds are often related--if you know where to look.

Sean (shawn), is the erse for John. it seems to have no relation...but if you know that erse has no J sound, and then look a Jean (french for John.)it makes sense... as does Ivan..(a russian form of John!)

(and that about wraps up my knowledge of russian!)