Guðþormr (Gudröd) Ívarsson King of Dublin - Accuracy of wife's ancestry

I am not sure what it signifies but i also note that Ivar's grandson Sitric "Cáech" ua Ímair, King of Dublin & York has a granddaughter named Maelmaire (not currently shown on Geni) which is the same name as Niall's daughter, Maelmuire O'Neill. Coincidence or further evidence?

He might very well be the son AND father of Ivar, but the Ivars will in that case rather obviously be different ones... it's a very common name.

Imair is likely to be "the way the Irish wrote Ivar", and Niall "the way the Irish wrote Njål" (or the other way round). Conssitent spelling in a mostly pre-literate culture (and where a lot of the literacy was in runes!) is too much to be expected.

https://no.wikipedia.org/wiki/Nj%C3%A5l says that the name Njål is derived from the Irish name Niall, but it's quite common in Norway.

In older manuscripts Ímar is often spelled Ímhar, and in Gaelic "mh" is pronounced like a "v". Might be relevant here. I don't know. Ímar is the nominative form and Ímair the genitive form.

I've not seen any suggestion anywhere that Imar had a son named Guðþormr, or anything similiar, except here on Geni, which is why i am inclined to suspect that it is a misplaced duplicate of Ivar's father,

Thanks for the info re Neil/Njal, odd that Cawley makes such a simple mistake - "“Niel” would seem to be an Irish rather than a Norse name.",