Enno is a Frisian name and was carried by many Frisian tribal chiefs. It is the abbreviation presumably of names starting with Egin- (e. g. Eginhard), Ein- (e. g. Einhard) or Arn- (e. g. Arnold). Thus it relates back to egin/agin "sword", agi "fear", "terror" or arn "eagle".
indicate the level to which a name has been verified.