So far for boys we like: Arlo Rowan Aleksander (family name with several spellings - poss middle name)
for girls: Completely stuck but love names like : Daria - (can'y use as too similar to family names) Marley love evangeline and genevieve as potential middle names but they are probably too long and a bit of a mouthful.
help on both boy and girl names and opinions on current boys would be great
Alesksander is great, and has lots of possible short versions, which will be handy for reducing the day to day number of syllables.
One thing to thing about is where you expect to live longterm, as it might be easier to live with the usual Anglicised version, Alexander, so he has one name he doesn't have to spell out all the time. (A friend of mine married a a man with a very unusually spelled surname, and chose very "plain" names for her children for that very reason).
For a girl, how about: Marlene, Marian, Daphne, Christina, Hermione, Penelope, Thalia?
I grew up with a long greek surname which I had to spell out all the time (and pronounce too!).
I know some children with a greek father called called Anna and Maria and Harry (although has the greek version of this I think). I also like Phoebe which has greek origins I think. Alexandra is nice too (I agree with the previous poster that I would use the anglicised Alexander).