Ailbhe is absolutely meant to be pronounced Alva, and is known as a female name.
Op, Ailill might be what you're looking for - similar to Ailbhe but is a guys name (though not something I've ever heard used or would expect to hear, it's from an old Irish legend). I've seen it spelled Aillil or Ailill.
Also: Oran (Odhran), Niall, Dara/Daire/Daragh, Padraig, Colm, Eanna, Fionn, Donnacha, Ruaidhri, Naoise, Finbar, Fionan, Diarmuid, Rian, Cian, Ciar, Cillian, Fiachra, Ciaran, Daithi, Senan, Iarfhlaith (Iarla or Jarlath), Caoimhin, Peadar, Emmet, Fergus, Lorcan, Lochlann.
All accepted boys names - some popular, some less so.