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 fun one, because we’ve got examples from 16th C England and 13th C Germany and we have no idea if they represent the same name or not.
There’s every reason to think that these are distinct names; but there’s also no reason to think that they aren’t the same. This is in part because we have no idea what name this could be; pretty much the only possible possible explanation is that the 16th C English form is a double diminutive of Sibyl via such forms as Sybeye and Sybbie.
Have you got any other ideas? Reasons to think these are the same name? Different names? Please share in the comments!