Hi! Just make it classier! If you have is documents, search for a second name of his line, such as a sire/dam/grand sire/grand dam surname, or even just the name of a member of his family. Also, you can give him a last name related to you, like the initial of your first and last name, Triumph MW. Hope I helped!
Maybe extend his name to Triumphant and put another word at the end. For example: Triumphant Wonder.
You can put your town's name before the name Triumph for example i'm from Portugal so can be Portugal's Triumph