Douglas goes beautifully
I also like Frank but as a full name Francis goes much better with Wilfred than Franklin
Max is fine
Bruno and Remy don’t go and are slightly middle aged and sweaty
Otherwise - Ernest nn Ernie, Laurence nn Laurie, Rufus, Rafe, Miles, Giles, Walter, Silas, Seth, Ivor, Philip nn Pip, Arnold nn Arnie, Arthur nn Art/Artie, Alfred nn Alf, Joss, Lachlan, Hector, Nathaniel nn Nat/e, Edwin/Edgar/Edmund nn Ed, Barnaby/Barnabas nn Barney, Hugh