I’m only 18 so I’m probably not going to have children anytime soon. However, these are my current name crushes.
For boys:
[name_m]Gideon[/name_m] (after my late beloved grandfather, good Biblical and Hebrew name).
For girls:
[name_f]Gwendolyn[/name_f] (Looove this name, worried that it sounds too much like [name_m]Gideon[/name_m] though).
[name_f]Josephine[/name_f] (goes well with [name_m]Gideon[/name_m], same number of syllables, another Hebrew name).
Welcome to the community! I DO think that [name_f]Gwendolyn[/name_f] & [name_m]Gideon[/name_m] are a bit close for siblings, but I like [name_m]Gideon[/name_m] & [name_f]Josephine[/name_f] together!
Personally the only one that is my style is [name_f]Josephine[/name_f]. 
Any combo ideas for any of these names?
Love [name_m]Gideon[/name_m] and [name_f]Josephine[/name_f] together. I agree [name_m]Gideon[/name_m] and [name_f]Gwendolyn[/name_f] are quite close. Perhaps just [name_f]Gwen[/name_f] or maybe
[name_f]Gwyneth[/name_f] or [name_f]Guinevere[/name_f]?
Gideon and [name_f]Josephine[/name_f] are lovely together
I like [name_m]Gideon[/name_m] with [name_f]Josephine[/name_f]! [name_m]Gideon[/name_m] and [name_f]Gwendolyn[/name_f] are nice too, but a bit to similar for my taste
I don’t think [name_m]Gideon[/name_m] and [name_f]Gwendolyn[/name_f] are too similar for siblings - I find the set really endearing and well-matched! It would be a little weird to have a third sibling in the set though, as both matching [name_m]Gideon[/name_m] and [name_f]Gwendolyn[/name_f] and deviating a lot from them would, imo, then stand out.
I really love [name_m]Gideon[/name_m] and [name_f]Josephine[/name_f] together as well!
Genevieve maybe?
That could work 