"It's Midgardian custom for one or the other spouse to take the other's name if they so choose." Truth. "Some choose to hyphenate both names, like Thor Stark-Odinson or Thor Odinson-Stark." Both of which strangely enough sounded better than Thor Stark.

"Given that Tony's agreed to have a ceremony according to our custom --" Partial truth. "-- I thought it would be fair for me to adopt some of his own as well."