Eddie,
Billy and
Robbie are all nice nns, but they need the option of something more adult to fall back on later. Ideas:
Eddie:
Edmund /
Edmond, Eamon(n) (pronounced "AY-mun," this is the Irish form of
Edmund),
Edwin,
Cedric, Hedrick,
Frederick,
Jedidiah (sp?),
Mohammed,
Wilfred,
Manfred,
Alfred;
Billy:
Willem,
Abel,
Hannibal;
Robbie:
Rupert (form of
Robert),
Robin (variant of
Robert).