I think it depends what pronunciation you prefer.
Isla I think would be the easiest pronunciation wise. The others I would hedge before pronouncing. [name_f]My[/name_f] second runner up would be [name_f]Ayla[/name_f], but that’s only because I know someone’s with this spelling, so it seems familiar (but I’d still waffle between saying eye-la or ay-la)
Isla or [name_f]Ayla[/name_f]
Omg first time i realise [name_f]Isla[/name_f] and [name_f]Ayla[/name_f] are the same name hahahaha I like both equally. [name_f]Isla[/name_f] spelling feels more vintage, and [name_f]Ayla[/name_f] more trendy
I know two girls with that name - [name_f]Isla[/name_f] and [name_f]Eilah[/name_f]. Personally I prefer [name_f]Eilah[/name_f].
Isla
I feel like I would pronounce these differently. Especially [name_f]Isla[/name_f] vs [name_f]Ayla[/name_f].
Isla I would say eye-lah and [name_f]Ayla[/name_f] I would say aye-lah
I prefer [name_f]Ayla[/name_f] out of all of your options.