Surname and Firstname Input Throws an Error

We have challenges with some phones while using the Medic Android app to register clients.
While typing names, the error “Names should only contain alphabet characters” is thrown on both surname and firstname, will appreciate any suggestions?

@oyierphil I suspect your name validation is a bit too strict. My hunch is that the keyboards on those phones are adding accents or invisible characters that aren’t matching. Can you share your configuration, or at least what you’re using for validation for name fields in that form?

@gareth, I share the validation for name for your review, thank you

Interesting, it works for some phones while brings the following error on some, “Names should contain alphabet characters

Will appreciate your insights

Will appreciate any insights, especially to someone who has had a similar challenge