Ragnall occurs in Old Irish,[1] and Middle Irish/Middle Gaelic.

[2][3] It is a Gaelicised form of the Old Norse Røgnvaldr, Rǫgnvaldr, Rögnvaldr.

[6] Ragnall can be Anglicised as Ranald and Ronald, and Latinised as Reginald, Reginaldus.

Anglicised forms of Raghnall include: Ranald, Rannal, and Ronald.

In this way the name is similar to the various forms of the Gaelic Domhnall, which can be Anglicised as Donald.