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 an odd one found in 11th C Belgium. The only instance we can find of this name on the internet is the single instance in the Dictionary, a witness to a charter. It could be an editorial error, or a scribal error, but if it is, it’s not clear what it is an error for.
Is the fact that the substring denis, an actual, identifiable name, relevant? What if we interpret that f as s? We’re clutching at straws here — if you’ve got any thoughts, please share in the comments!