Ragnar (Old Norse: Ragnarr [ˈrɑɣnˌɑrː]) is a masculine Germanic given name, composed of the Old Norse elements ragin- "counsel" and hari- "army". . Origin and variations. The Proto-Germanic forms of the compounds are "ragina" (counsel) and "harjaz" or "hariz" (army). The Old High German form is Raginheri, Reginheri, which gave rise to the modern German form Rainer, the French variant Rainier, the Italian variant Ranieri and the Latvian variant Renārs. The Old English form is "Rægenhere" (attested for example in the name of the son of king Rædwald of East-Anglia).
https://en.wikipedia.org/wiki/Ragnar