I've always liked
Shawna. It's pretty dated, but in a good way to me. Like it makes me think of a smiling, upbeat, friendly, athletic person.
When I was a kid my aunt's best friend/neighbor (my aunt being 9 years older than me) was named
Shawna, so I always saw it as a "cool older kid" name. I also went to high school with at least one, and was friends with her. Not sure I've ever met a
Shauna or Seana though.