All our sons' names start with a vowel. Also either the first or second name is easily accepted in the Filipino community (ie Spanish or Italian origin makes it easy to pronounce or spell in Tagalog). The girls on my side of the family, however, have a middle name that is from a maternal family member. My sister's middle name is after my mother's mother, my middle name is after my father's mother, my one niece's first name is after a family ancestor, you get the picture.
So anyway, we have an A, an E, an I, and an O. So that leaves U or perhaps Y.
there aren't that many.
Ursula
Yasmine
Utah (but we have never lived there nor plan to, so it seems silly, although one could certainly say the same for Uganda, Uruguay or Yugoslavia).
Uganda
Uruguay
Yugoslavia
Ulysses
Dp really likes Yoda, but I *think* he is kidding.
Upton
Urban
Unity
Also Yvonne (but I hate it) and Yves (but I am not sure how to pronounce it).
For a girl I was thinking Ursula Marisol or Yasmine Isabella. I like Ulysses for a boy, but not sure of a middle name. At one point DP liked Ulyssio, but has since decided he doesn't like it. I think there are probably some really cute, short names of Asian origin that would fit our criteria, like Yim or something- but I haven't read that many books in Asian languages, and they don't pop up on baby name lists.
I guess I have a while to figure it out. Our last baby (O) was nameless for a day.
There is a part of me that would REALLY be tempted to name our baby Yoda if it comes out with huge ears.

Ooh! I just looked up some geography on the Philippines, and I found,
Ubay
Yeto
Unib
Usada