| Mac Raghnaill | |
| Gender: | Masculine |
| Language: | Irish |
| Language origin: | Irish |
| Meaning: | "son of Raghnall" |
| Variant: | Mac Rághnaill, Mac Raonaill |
Mac Raghnaill is a masculine surname in the Irish language. The name translates into English as "son of Raghnall". The surname originated as a patronym, however it no longer refers to the actual name of the bearer's father.
The name Raghnall is a Gaelic derivative of the Old Norse personal name Røgnvaldr / Rǫgnvaldr / Rögnvaldr. Variant forms of the surname include Mac Rághnaill and Mac Raonaill. These three surnames can be Anglicised variously as: Grannell, MacRanald, MacRandell, MacCrindle, MacReynold, MacReynolds, Randalson, Rondalson, Reynoldson, Rannals, Randals, Randles, Ranolds, and Reynolds. The Irish surnames are borne by numerous unrelated families; some are of Irish origin, others of Scottish origin,[1] some are of English origin, and some may be of Norwegian and or Danish origin.