My mother in law b 1920 had Louise as a second name, or sometimes it was Louisa!, even now if you ask her two children they are not 100% sure which is right, and have to check her birth cert. so I don’t think you can get too bogged down in one vowel.
Similarly my own name has an A on the end, but I am frequently called by the version with an E and there are probably some officialish documents out there with the wrong name on.
And even some with another name that starts with he first syllable of my correct name!
Trying to think of an example that isn’t mine...
Say. Annabelle. Annabella. Anastasia.