I know fraternal twins named
Monica and
Carmen. As a kid, I remember liking the asymmetry.
My sister and I aren't twins, but we were intentionally given names that begin with the same letter. That's fine with me but not something I'd do.
If I was a twin, I don't think I'd like having a name that intentionally had the same meaning as my twin's. I'd think: we're separate people; we should have separate names/meanings. I don't think I'd appreciate our names being opposites either; it'd be like setting us up in opposition to each other.
If I had twins, I wouldn't want the names to clash (same for any sibset), but I wouldn't intentionally match them. I might worry less about using similar sounding names, though...like,
Astrid and
Esther are a couple of my favorite names: I wouldn't use those for non-twins because they sound too similar to me, but maybe I would for twins.