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Alys is both, afaik - it works as a 'Wenglish' version of Alys and it's one of umpteen medieval English spellings used before standardisation.
I didn't know Menna was a Frisian name - I wonder if they're connected somehow. Looking at the birth records of Mennas here, there's a couple amidst all the Welsh Mennas who could be Frisian - one with 'Mistje' as a middle name and one with a very Dutch-sounding last name.