I like, it's got a cute, clunky vibe that I dig. It's not my very favourite Rose/a name (I prefer
Rosemary,
Rosalind and Rosalie...and just plain
Rose), but that's only b/c I have a pretty strong (and admittedly weird) aversion to the word "mound" (shudders) and it's just a little too close for my comfort, ha! I do prefer the Rose-a-mund pronunciation as well.