Herr Look up Herr at Dictionary.com
German equivalent of Mr., 1650s, originally "nobler, superior," from Middle High German herre, from Old High German herro, comparative of her "noble, worthy, exalted," from PIE *kei-, a color adjective, in suffixed form *koi-ro- here meaning "gray, hoary," hence "gray-haired, venerable." Cognate with Old Frisian hera, Dutch heer; perhaps in this usage a loan-translation of Latin senior. Hence also Herrenvolk "master race," in Nazi ideology, the concept of the German people.