A real Fucker?

This just in from Maisie of the Motte, and found on Stumble:

John le Fucker
A man’s name, “John le Fucker”, is said to be reported from AD 1278, but the report is doubtful: an email discussion on Linguist List says:
[4] This name has been exhaustively argued over… The “John le Fucker” reference first appears in Carl Buck’s 1949 Indo-European dictionary. Buck does not supply a citation as to where he found the name. No one has subsequently found the manuscript in which it is alleged to have appeared. If the citation is genuine and not an error, it is most likely a spelling variant of “fulcher”, meaning soldier.