Every Monday we will post an entry that hasn’t yet been published with a view towards harnessing the collective onomastic power of the internet. If you have any thoughts about the name’s origin, other variants it might be related to, other examples of its use, etc., please share them in the comments! If you wish to browse other Mystery Monday names, there is an index.
Today’s name is a feminine name recorded in Latin in late 13th or early 14th C Bergamo. It’s a strange name because that central vowel cluster — oey — is definitely atypical. (In our 66,000+ citations, we have only one other instance of this cluster, in an Old French form of Louis). But the rest of the name doesn’t give us many clues to go on either — -etta is an Italian hypocoristic suffix, found in Angeletta and Bonetta, and more commonly in the masculine form -etto; and Italian forms of Thomas and Thomasse can be truncated to Maso- or Masa-, with further diminutive suffices added. So it’s possibly that Masoeytta is the result of truncating Thomasia or Thomasa and then adding -etta, but where is the -y- coming from? And why is it -o- instead of -a-?
We have no idea. Do you? Got any hypotheses about how to explain these interloping vowels? Please share in the comments!