were expecting a baby boy in march, we already have 2 little girls [name_f]Ava[/name_f] and [name_f]Leela[/name_f], we want to give him an uncommon and unusual name but just cant agree on any 
what are your favourite unusual boys names? 
These might be too popular and common for you but I do think these sound like a sibling to [name_f]Ava[/name_f].
Suggestions:
[name_m]Asher[/name_m]
[name_u]Finn[/name_u]
[name_u]Flynn[/name_u]
[name_m]Felix[/name_m]
[name_u]Theo[/name_u]
[name_m]Jack[/name_m]
[name_m]Liam[/name_m]
[name_u]Jude[/name_u]
[name_m]Gavin[/name_m]
[name_u]Owen[/name_u]
[name_m]Ethan[/name_m]
[name_m]Callum[/name_m]
[name_m]Declan[/name_m]
[name_m]Ezra[/name_m]
[name_m]Elijah[/name_m]
[name_m]Milo[/name_m]
[name_m]Jasper[/name_m]
[name_u]Arlo[/name_u]
Nameberry has a list but they might be too unusual:
Or ones on trend like [name_f]Ava[/name_f]:
[name_f]Ava[/name_f], [name_f]Leela[/name_f], and…
[name_m]Oren[/name_m]
[name_m]Atlas[/name_m]
[name_m]Bodhi[/name_m]
[name_m]Caius[/name_m]
[name_u]Cato[/name_u]
[name_m]Valor[/name_m]
[name_u]Baze[/name_u]
[name_m]Lenox[/name_m]
[name_m]Rocco[/name_m]
[name_u]Quinn[/name_u]
[name_m]Dante[/name_m]
[name_m]Kwan[/name_m]
[name_m]Locke[/name_m]
Kailand
[name_m]Gage[/name_m]
[name_m]Otto[/name_m]
[name_m]Zeke[/name_m]
[name_m]Atlas[/name_m]
[name_f]Hope[/name_f] you like some of these
[name_u]Bentley[/name_u]
[name_m]Devante[/name_m]
[name_u]Loren[/name_u]
[name_m]Thatcher[/name_m]
[name_u]Winslow[/name_u]
[name_m]Icarus[/name_m]
[name_u]Sorrel[/name_u]
[name_u]Jericho[/name_u]
[name_m]Vail[/name_m]
[name_u]Porter[/name_u]
Naoki (Japanese name roughly meaning “straight tree”)
[name_m]Oslo[/name_m]
Remley
[name_m]Anders[/name_m]
Findlaech or [name_m]Findlay[/name_m]/ [name_m]Findley[/name_m]
[name_m]Ajax[/name_m]
[name_u]Roscoe[/name_u]
[name_m]Belvedere[/name_m]
[name_f]Valen[/name_f]
Orlon is one I ran across the other day! There’s also [name_m]Waylon[/name_m], [name_m]Coen[/name_m], and [name_m]Otto[/name_m].
[name_u]Oakley[/name_u]
[name_u]Harley[/name_u]
[name_m]Wilder[/name_m]
[name_u]Calder[/name_u]
[name_m]Atticus[/name_m]
[name_m]Becker[/name_m]
IF YOU’re looking for a unique name as a sibling to [name_f]Ava[/name_f] & [name_f]Leela[/name_f], I would look for one that is right on trend but further down the popularity charts so it doesn’t sound out of place with your daughters names.
[name_f]Ava[/name_f], [name_f]Leela[/name_f] & …
[name_m]Abram[/name_m]
[name_m]Dashiell[/name_m]
[name_m]Heath[/name_m]
[name_u]Kai[/name_u]
[name_m]Penn[/name_m]
[name_u]Roscoe[/name_u]
[name_m]Baxter[/name_m]
[name_m]Bowie[/name_m]
[name_m]Hayes[/name_m]
[name_m]Bowen[/name_m]
[name_m]Noam[/name_m]
[name_m]Olin[/name_m]
[name_m]Kenzo[/name_m]
[name_m]Lonan[/name_m]
[name_m]Miller[/name_m]
[name_m]Hale[/name_m]
[name_u]Grey[/name_u]
[name_m]Felix[/name_m]
[name_m]Brando[/name_m]
[name_u]Calder[/name_u]
[name_m]Frey[/name_m]
[name_m]Albin[/name_m]
[name_m]Kiro[/name_m]
[name_m]Finnick[/name_m]
[name_u]Corin[/name_u]
[name_m]Ammon[/name_m]
[name_m]Amos[/name_m]
[name_u]Arlo[/name_u]