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 of Breton origin, from the Redon cartularies. The prototheme is easily identifiable, as it shows up in many early Breton and Welsh names, but the deuterotheme is opaque to us. We have found one other example of it, in the probably feminine name Prostlon. The element may be a reduced form of Old Breton uuallon,Old Welsh uualaun, uualon ‘valorous’, but this is only a conjecture. Does anyone have any alternatives? Or support for this conjecture? Leave a comment below!