I would almost prefer twin names to start with different letters, so the child can have some sense of personal identity.
Twins I know:
Susan & Sandi - my sis-in-laws
Michelle &
Jennifer (age 2) - while not my favorite names, they go well together because while they are distinct names, they both had their heyday in the 60s-80s range.
Pam &
Paula - girls I went to school with
Ann &
Susan - they used to babysit me!
Josephine &
Jenny - my great aunts. (
Jenny may have been short for something Italian, I'm not sure).
Edward &
Anthony - my mother's first cousins