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.
Here’s one for the Breton experts!
The prototheme is Old Breton hael ‘generous, noble’, a relatively common theme found in the names Brithael, Haelcar, Haelhoiarn, Haelnou, Haeloc, and Haelwaloe, but we don’t recognize the deuterotheme. If you have any thoughts of what it might be, please leave a comment!