The English (and many other ) Wikipedias use "Authority Control"; identifiers like VIAF, ORCID and several others, which help us to disambiguate people with the same name, and to be sure that the subject is the same person as that referred to in other sources.
The main tool for doing this is the template:
https://en.wikipedia.org/wiki/Template:Authority_control
I can see no evidence that the template, or Authority Control in general, is used on the Welsh Wikipedia (I'm not a Welsh speaker). Have I missed somethng? If not, I'd be happy to advise on its implementation.