Ólafur Gudrodsson King in Ireland Guðröðarson, King in Ireland - Alternative Data After Merges

Ólafur OR Olav,
or Olof or Olaf, it doesn't matter, all those are just variants on the same name. Ólafur are an Icelandic variant, Olav are Scandinavians ditto.

"Ynglinga och Skilfingätten", both are correct but most correct would be to use the suffix " Ynglingaätten d.y".

Thanks Ulf; What does it mean?

The family of Ynglinga, the younger, (Yr.).

What's the basis of "Skiflingaätten"? I can't place that reference offhand.
The Ynglings are more well known (the descendants of Ynvgve-Frøy).

Harald, I'm going to let you and Ulf update here. I was just sending the alert. Thanks for engaging, you guys.