The Social Security Administration. came out with their list of the most popular names for 2018. For boys the most popular name was Liam. For girls it was Emma. I have to be honest, I don't know any kids named Liam or Emma. I wonder if you can break it down by state? I'm guessing its way different in Montana than New York or California. In fact, I'll bet the most popular name in California isn't on the list from the Social Security Administration.