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I didn't mean to imply that Ivars didn't also have a Scandinavian origin. It's just one of those cases where the same form can have two or more different etymologies. I focused on the Spanish form because you didn't mention this in your original query. Most of the facts you cited about the Scandinavian Ivars are correct as far as I can tell. The name is related to English Ivers which Hanks & Hodges (A Dictionary of Surnames) derive from Old Norse Ivarr which is "of uncertain origin, probably from iw, yew, bow and herr, army." If the name was once found in Normandy, it's because some Vikings brought it there, not because it has a French origin.