If you really want to use twin sets, it'll be a lot cleverer to pick names that are less obviously twinny.
Kaleigh and Landeigh, beyond just being trendy and misspelled, are obvious to the point of being tacky. Combos like
Luna and
Estelle,
Dylan and
Maris, or
Alyssa and
Veronica are twinny without being terribly tacky.
However, it's nicest just to go with two names you like, IMO.
Array
"Phineas. That's an interesting name."
"Yeah. It's Latin for 'kick me'."