I’ve done a lot of work on medieval names so I can help with that if you like :)
One thing to remember is that until printing became commonplace there was no such thing as the “correct” spelling in English; and until compulsory education was widespread it was still very fluid. People spelt things however seemed best to get their sound across.
Additionally, names were frequently recorded in a Latinised form on official documents whereas they would use a vernacular form in everyday life. For example, a girl might be christened Matildis, and that name recorded in the parish register, but she would only ever have been called Matild in daily life.
So, spelling variations have been with us for a long time!
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…are human rights
Cats aren’t a human right, but they are pretty awesome 🐈⬛🐈⬛