Do you think that siblings should have names similar in style/popularity?

It all depends. I know a family that coincidentally named three kids with "z" names and the other two with c and l. it's sort of odd, but my family gave us all greek names. they dont sound alike at all, but they have a theme. my fathers family all have roman/latin names. i think, if you want a pattern, go for a more subtle one, such as a not too obvious theme, rather than by first letter. also, ophelia isnt a very pretty name, and i think the modernistic clashing with the old is the same sort of problem as the first letter.