Our daughters name is Isabella Grace, we call her Bella Grace (means beautiful Grace, to us meaning God's beautiful grace)
with my mom's first name as another middle name. Pauline.
as something fun , we had Arabella Tallulah on the list as well, i kept telling my husband. Bella Lu sounds cute right! ? haha.. it started to grow on me actually
Other strong names to me would be Lorelei,, Sloan, Grace, Amelia, Daria, Ava is big these days.
Rhianon and Raven are a few favorites of mine, not sure how professional they would be, but maybe your daughter won't go into the professional world.
you could do double p's.. give her a name that starts with a P like your son. Our last name starts with a P, so it didn't really sound good for us. but for more fun i put on the list Paisley and Precious..hahaa..
lastly,, we went in with about a dozen names and waited till we saw our son, then went over the names. he looked like a cooper elijah and not so much a luke or elijah.
we knew Bella would be Bella, she was so early. 12 weeks early. we didn't have time to see her to see if she looked like a bella. i would suggest having a few names and maybe see what the baby looks like. or how the name feels on the kid :))