Andrew's little brother

Hi friends, first time posting.

We are expecting our second boy, we've began thinking of names & we'd appreciate your help.
Last name is 3 syllables- stress on the second syllable and middle name most likely will be John.

His big brother goes by Andrew, Andy & Αντρέας because mom is Greek.

We'd ideally like to have the name translate to a Greek name but we realize that's not as ease as it seems. And we live in the States.

Our main choices are:

- Alexander / Alex / Αλέξης
- Mark / Μάρκος (Marco-Polo, yeah might not be the best?)
- Frederick / Freddie / no Greek name really here

Send us your suggestion so we can boost our list up a bit.
And of course ask question if you'd like