Liam and Olivia Were Most Popular New Jersey Baby Names in 2020 In 2025, there are going to be a whole mess of kids named Liam, Olivia, and Emma in kindergarten classes in the Egg Harbor Township and Greater Egg Harbor school systems. The Social Security Administration has released the top baby names for 2020 and New Jersey pretty closely matches the rest of the country when it comes to popular names for the little ones. Get our free mobile app In New Jersey, the most popular boys names in 2020 were Liam, Noah, Lucas, Joseph (yay!), and Jacob. The two most popular boys names in the United States were also Liam and Noah,. Lucas was #8 in the country, but Joseph and Jacob didn't make the Top 10 list nationwide.