what does his breath smell like?
Is that your way of suggesting Ralph?

Clive is FIL's name, and has already been used by his dutiful daughter.

Love Frank, and Fred (although Brisbane had a famous couple, historically, called Eleanor and Fred. Is that good, or bad?) and Abraham, but I think that's out with our surname.

Heathcliff is awesome! It gets me cliff without breaking the Scrabble Board Rule!

Oliver = top 10 (that's an FYI tashy)
Sydney's an interesting option... DH is iffy with place names (no Geneva or Adelaide) but maybe I could sneak it through.
Horatio will get a no because of CSI
D'Artagnan is swoon-worthy.
Fitzwilliam, ditto, will get a no, but I like it.

I really like Wilfred. But THAT is a dog's name, without a shadow of doubt.