Harry and Amelia most popular baby names Among the girls, Mia and Isla replaced Ruby and Grace in the top 10 by climbing six and seven places from numbers 13 and 15 respectively to fill the seventh and eighth slots. In Wales, Jacob was the most popular name for baby boys, replacing Oliver, while Amelia replaced Lily as the most popular name for baby girls. The success of some famous faces could be behind the popularity of some names, according to the ONS, which added that the religious, cultural and/or ethnic background of parents may also be key. Family members, friends or fictional characters could be a factor behind the great diversity of baby names. Hugo, Sonny, Seth, Elliott, Theodore, Rory and Ellis were the only new names for boys to appear in the top 100. These replaced Joel, Hayden, John, Ashton, Jackson, Ben and Reece, which fell out of the top 100. Hugo came in as a new entry at number 88, up from 139, while Sonny stands at number 90, up 18 places from 108. Seth was a place behind, having jumped 10 spots in the popularity chart, while Elliott came in at number 95, up 12 places, and Theodore moved 27 places to number 97. Rory was ranked at number 99, having risen by 11, and Ellis came in at 100, up three spots. Bobby made the biggest jump in popularity, rising 19 places to become the 57th most popular boys' name. Frankie, at equal 66, Arthur up 16 places to number 52, plus Jenson and Blake, both up 13 to 54 and equal 66 respectively, were also popular high climbers. Among the top 100, Aiden, Finlay, Jamie and Rhys saw the largest slides in popularity.