Miriam Cecilia or Thomas Allan?
(no, we're not having twins but I've been teased enough that I'm curious)
I'd probably use Julian Donald for Thomas. Thomas is in honor of Thomas Merton and Allan is the middle name of my Dad and grandfather. Julian is in honor of Julian of Norwich, Donald is my husband's grandfather.
I'm thinking of Judith Mae for Miriam. Judith is my aunt, Mae its my grandmother-in-law. Cecilia is my husband's aunt. Miriam I just love.