My grandfather used name Carl Brenna in US.The only 2 records I can find on him are his 1918 US draft reg card and 1920 US census.
Have been unable to trace him in Norway.I think he probably used patrinymic in Norway, not Brenna (farm name, right?).He married my grandmother, Thora Larsdatter Rust (used Larson for Atlantic crossing) in Portland, OR, around 1919-1920.Although she was from Oppland (Bøverdalen) and I have lots of info on her, they supposedly never met in Norway.Family rumor was that they were from geographically close areas in Norway.
On draft reg card he lists Julia Brenna of Trondhjem as nearest relative.Also says on card he first entered US in 1909.I think he may have entered and/or left US via Canada.
Family rumor also implied he deserted his wife and infant son in early 1920's.