Ragnvald, Rögnvald or Rognvald or Rægnald is an Old Norse name (Old Norse Rǫgnvaldr, modern Icelandic Rögnvaldur; in Old English Regenweald and in Old Irish, Middle Irish Ragnall). Notable people with the name include: Ragnvald Heidumhære (9th century), King of Vestfold. Rognvald Eysteinsson (fl. late 9th century), Jarl of Møre. Ragnall ua Ímair (died 921), King of York. Ragnall Guthfrithson, co-King of York, 943-44. Ragnall mac Gofraid (died 1004/1005), King of the Isles. Rogvolod (mid-10th century), Prince of Polotsk. Ragnvald Ingvarsson (10th century), officer of the Varangian Guard.
https://en.wikipedia.org/wiki/Rognvald