Your Brother's Nicknames: 200 A nice nickname for a cute brother is Boo. If he reminds you of a honey-eating pooh, he's Pooh bear. Bambam - For a sweet little brother. If he's a little fat, he'll be called Chubs. Pumpkin — If he's sweet and lively. When he's a small bundle of joy in your life, call him Bubba. There are more stuff