I know sisters named [name]Ada[/name], [name]Thea[/name] and [name]Una[/name], it never struck me as odd.
I think [name]Alexa[/name], [name]Maya[/name] and [name]Cora[/name] are nice together. They are very different names, fierce, cute ([name]Maja[/name] would be even cuter) and calm. [name]Eliza[/name] (spunky) works with the last two, not [name]Alexa[/name]. The same for [name]Elaina[/name].
If I met sisters named [name]Cora[/name], [name]Maya[/name], and [name]Eliza[/name] (especially if there was a brother’s name added in there), I wouldn’t even notice that they all end in an “A”. The only time I notice endings is if they’re super matchy, like [name]Grayson[/name], [name]Emerson[/name], and [name]Hudson[/name], or [name]Ariana[/name], [name]Liliana[/name], and [name]Juliana[/name]… I think [name]Maya[/name], [name]Cora[/name], and [name]Eliza[/name] are fine, though.