[Facts] First name: Colman
I just found an ancistor with the given name Collman (in an Austrian (German speaking) register: https://data.matricula-online.eu/de/oesterreich/graz-seckau/st-kathrein-am-offenegg/7084/?pg=56 ;on the right side, page 109 4th listing, october 22nd 1720: child: Elisabetha, parentes: COLLMAN Schattleither (father) etc.) It is very rare in German speaking countries.
Replies
Colman is an Anglo-Saxon name composed of col (coal) and man (man). The most famous bearer of the name was the first Bishop of Lindisfarne. He is said to have been born in Ireland, so in his case Colman may be an Anglicized form of some Celtic name. The Vikings destroyed the monastery of Lindisfarne on 8 June 793, but they picked up the name Colman and spread it across Europe.