Richard Bridge seems to think that my name is found only in UK. Sigh!

Actually most of the list of putative UK names (Nigel, Trevor etc; even Tarquin) seem to occur with a fair frequency here.

But it's a long time since I came across (in Oz)
Cyril
Cecil
Cedric
Evelyn (a bloke)
Vivian (ditto)
Peregrin (as distinct from Perry).

My sister's names are Roslyn & Hilary and I know various wome with Penelope, Daphne, Prue and even Prudence (as well as the other virtues like Faith, Hope, Charity and Verity) so I wouldnt count them as particularly UK. Don't see Beryl, Molly, or Polly often these days in Oz, either.

Savannah (as a woman's name rather than a vegetation type) I associate with the US, along with Duke and Earl as given names.

Cheers, Rowan