I've been thinking about how spellings can be altered by the use of common words. I might be wrong about my assumption, but Isabeau is a good example of how spellings of names can be altered by the use of common words.
I don't have a specific question but if you know examples of this phenomenon and research about this phenomenon please share.
I remember encountering a similar phenomenon in the past but I can't recall what names I was thinking about at that moment.
It's quite intriguing how names are influenced by our vocabulary and sometimes even by other names.