Separate the names are fine, but I wouldn't think much if I saw them. But
together, oh man, that's another story.
Arnold and
Sylvia go together surprisingly perfectly! I never would have thought about it before.
Arnie and
Sylvie (or even
Ollie and
Vivi) would be
adorable together. My gosh, I'm gonna have to give this set some more thought; I do believe you've struck gold!