No Gaelic version of the name.
In Scots Gaelic it is spelled IAIN.
No.
Críostóir (male name)
River, first name, last name?
O'Sullivan = Ó Súilleabháin
Kid Jensen's birth name is David Jensen.
if you're talking about the name Butler, then it is "de Buitléar".
Ben Jensen's birth name is Ben Peter Jensen.
Brandy Jensen's birth name is Brandy Marrissa Jensen.
Jackie Jensen's birth name is Jack Eugene Jensen.
Tully Jensen's birth name is Alicia Tully Jensen.