Dead beat dad or no?

Okay, so my husband's niece just had her first child. She's 20. She lives with her parents, has no job, and is in an on and off relationship with the baby's father. She went into labor. They obviously tried calling the baby's father. They called and texted over many hours. The soon-to-be mom said it had been a few days since they had seen or heard from him. They went to the hospital around 7 PM and he was born at 1:36 AM. They tried to get in contact for that amount of time. Still no answer. She still gave the baby his surname! To me, I almost find it stupid. She did all the work and didn't even get support from him. Would you declare him a deadbeat or no? Would you have given the baby his surname or no?