Neithon of Alt Clut

Neithon son of Guipno (died c. 621) was a 7th-century ruler of Alt Clut, a Brittonic kingdom based on Dumbarton Rock.

According to the Harleian genealogies, he was the son of Guipno map Dumnagual Hen.

However, it is possible that either as an Alt Clut Briton ascending the throne of Pictland, or as a Pict ascending the throne of Alt Clut, his genealogy might have been altered, and it is notable that in the Pictish king-lists he is called "Nechtan, nepos Uerb", suggesting that it was a descent from Uerb that mattered in Pictland, and not his unimportant father Guipno/Canu.

Alan Orr Anderson pointed out that Uerb is probably the Pictish form of Ferb (genitive Feirbe), a female name.

[4] Alan MacQuarrie suggests that Neithon was indeed the Pictish king Nechtan, but does not take any stance on the Guipno/Canu problem.