I love your kids’ names and the names you’re considering! My OCD would insist that you use another 4-letter vowel name and not with a letter you’ve already used…
I like:
[name]Isla[/name], [name]Owen[/name], and [name]Ella[/name] (It’s similar but I don’t think it’s too much.)
[name]Isla[/name], [name]Owen[/name], and [name]Emme[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Emma[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Elke[/name] (pn. [name]El[/name]-ka)
[name]Isla[/name], [name]Owen[/name], and [name]Anna[/name]
[name]Isla[/name], [name]Owen[/name], and [name]April[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Eden[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Anya[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Aria[/name]
[name]Isla[/name], [name]Owen[/name] and [name]Alla[/name] (not to be confused with Allah)
[name]Isla[/name], [name]Owen[/name], and [name]Amma[/name]
[name]Isla[/name], [name]Owen[/name] and [name]Alix[/name]/[name]Alyx[/name] (I think it feels more like a stand alone name when not spelled with the ‘e’)
[name]Isla[/name], [name]Owen[/name], and [name]Alba[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Elle[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Esme[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Etta[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Alma[/name] (it’s Spanish for soul. Ithink it’s super cute!)
[name]Isla[/name], [name]Owen[/name] and [name]Enya[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Elsa[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Yara[/name] (I decided to check Y as well)
[name]Isla[/name], [name]Owen[/name], and [name]Yael[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Echo[/name]
[name]Isla[/name], [name]Owen[/name] and [name]Ally[/name] (can’t resist suggesting it since it’s my own nn!)
Boys:
[name]Isla[/name], [name]Owen[/name], and [name]Eric[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Aldo[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Axel[/name] (super cool)
[name]Isla[/name], [name]Owen[/name], and [name]Arlo[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Abel[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Alec[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Alek[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Elmo[/name] (too [name]Sesame[/name] [name]Street[/name]?)
[name]Isla[/name], [name]Owen[/name], and [name]Ezra[/name] (two thumbs up)
[name]Isla[/name], [name]Owen[/name], and [name]Enzo[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Evan[/name]
[name]Isla[/name], [name]Owen[/name], and [name]Urso[/name] (kind of cool, I think)
[name]Isla[/name], [name]Owen[/name] and [name]Utah[/name] (maybe a bit of a stretch)
[name]Isla[/name], [name]Owen[/name], and [name]Yale[/name]
[name]Isla[/name], [name]Owen[/name] and [name]York[/name]
I hope you find something you like! Best of luck!