Well, I got the words to "Iko, Iko," and a lot of interesting theories about its origin and meaning. But now I'm wondering about the connection of "John," "Jack," and "James.!" "John" is "Jean" in French and "Giovanni" (or "Gianni," as in Gianni Versace) in Italian. "Jacques" would, presumably, be "Jack" in French and "Giacomo," in Italian, "Yakov," in Hebrew, etc. "James" is "Seamus" in Irish Gaelic, but is it the same name as "Jack" in the Italian and French versions?

No urgency to answer this. I'll look it up somewhere, in good time.