Tolkien establishes that Westron is translated as English, and other Mannish tongues are 'translated' as other Germanic tongues by analogy. (eg. Rohanese is Old English, Dalish is Old Norse)
However, some Hobbit names, especially among the Tooks, are based in Romance languages: Gerontius (the Old Took) (Latin, Greek influence), Belladonna, Mirabella, Donnamira (Italian), Fortinbras (French).
Obviously, in the 'untranslated' Middle Earth, such names would almost certainly be different, however we have little precedent for what languages are being 'translated' into Romance languages. My gut instinct is to say one of the Elvish tongues, especially given the Tooks' relative world-wisdom, but I could be wrong.