My DH is of Greek Cypriot heritage and we've more or less decided on Andrianna (nn Annie) if we have a daughter, whether that's now or a subsequent child.
For boys, we aren't necessarily looking for a Greek name, just something that would be pronouncable in Greek. Our two favourites are probably Caspar and Percy but we aren't sure whether they 'go' well enough with Andrianna (if we had an Andrianna in the future). I think they go fine with Annie, but not sure whether they go with Andrianna or indeed whether this matters! (I quite like Caspar and Andrianna together I think, they have the common 'a' repetition.) We've also considered names like Zachary, Sebastian and so on - longer names that are more similar in length to Andrianna - but we don't love any of them.
I guess my question is does it matter if siblings have names of very different lengths, in general, and how do Caspar or Percy sound alongside Andrianna as two examples?!