1 Sweetie: This is a very cute and common name that can be used for both boyfriends and girlfriends. 2  Pumpkin: This is a very cute nickname that can be used by you for your partner and to create a loving atmosphere among you two.3  Sweetheart: Besides using sweetie, you can use sweetheart for your boyfriend too. Sweetheart: Besides using sweetie, you can use sweetheart for your boyfriend too. 2  Other related names to this pet name are honey bun, sweetie pie, sweet muffin, etc. 3  Dear: This name is a cute way to refer to your loved one.