I like
Frank. It's, um, frank, and friendly and simple, and there are umpteen good namesakes from
Frank Capra to
Frank Black, or St.
Francis if saints are more your thing. I think it's fine alone or as a nn for
Francis,
Franklin etc, and I can see it fitting into the trend for old names. I just hope that if it gets into the UK charts it doesn't turn into
Frankie, because yuck.