How about these
-
Alyssa and
Dahlia ( they're both the names of flowers and you could call
Dahlia,
Lia for short, I think the nicknames
Lia and
Lyssa are cute!)
-
Nadia and
Natasha ( these names are both Russian, pretty, and they kinda have something in common,
Nadia means "
Hope" and
Natasha is associated with
Christmas, a season of
Hope.
Hope I've helped!