Rasven 2.1.1. - field "name" with input "René" doesn´t validate as "alpha"

My contact form has a field called "name".
the formset cntact.yaml says

validate:
name: alpha

Problem: Characters like ä,ü,ö or é will not validate and give an error. Unforunately "Müller" (engl. Miller) is one of the most popular last names in Germany :-(

Do I have to fall back to "notEmpty" or is there "alpha plus" validation rule for internaional use? I looked, but haven´t found one.

Thanks
Albert

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