I'm a twin and I know some other twinsets and none of them are very close.
My name is
Caroline and my sister is Terése ("french theme") It could also have been
Carolina and
Teresa.
When we started school there was another twinset in our class,
Joel and
Jesper. Later on we went to school with these twinsets:
Per and
ChristinaOscar and
Gustav
Personally I believe that twins' names don't have to "sound nice together" just because the twins do things togehter. That's just... I'm sorry...stupid. If I was having twins I would choose two names that I liked. I wouldn't care if they matched or not. (But normally they do because you have a certain naming style). In the end people will still talk about the "twins" and the two names will match each other because the persons behind the names match each other.