Amelia has been the most popular girls’ name in England and Wales since 2011 while Oliver has been in the top spot since 2013.However, this marks the first time Muhammad has been top in two areas, having overtaken Oliver as top name in the West Midlands from 2014.Four names – Jaxon, Roman, Reggie and Carter – broke into the boys’ top 100, taking the places of Owen, Robert, Joey and Finlay from 2014.Of these, Jaxon rose the most, climbing 35 places to number 80 while Kian fell 44 places to 98, the largest decline.There were six new entries in the girls’ top 100, these were Penelope, Mila, Clara, Arabella, Maddison and Aria. These replaced Lydia, Faith, Mollie, Brooke, Isabel and Amy from 2014.Of these, Aria showed the biggest ascent, shooting 70 places to claim the number 100 spot while Katie dropped the furthest – 22 places to number 99, just staying inside the top 100. There were 697,852 live births in England and Wales in 2015, with more than 27,000 different boys’ and 35,000 different girls’ names registered, the ONS said.The top 100 boys’ names accounted for 52% of all boys born in 2015, while the top 100 girls’ names accounted for 43% of all girls born in 2015.Half of the top 10 most popular boys’ names in 2015 had kept their place from a decade earlier in 2005: Oliver, Jack, Harry, William and Thomas. Daniel showed the biggest decline, having dropped 18 places since being in the top 10 a decade ago.Four out of the top 10 girls’ names in 2005 kept their place, these were Olivia, Emily, Ella and Jessica.Isla and Ava shot up 121 and 77 places respectively from their 2005 position to make it in to the 2015 top 10.Ellie has fallen 42 places in the rankings since being in the 2005 top 10 – the largest decrease in popularity for girls. Elizabeth McLaren, a statistician from the ONS, said: “Amelia and Oliver remained the most popular names for baby girls and boys born in 2015, having held the top spot since 2011 and 2013 respectively.”Ella re-entered the top 10 baby girls’ names in 2015 – Ella was last in the top 10 in 2007. Noah entered the top 10 baby boys’ names for the first time on record in 2015, following a gradual increase in popularity.”The statistics are “based on the exact spelling of the name given on the birth certificate; grouping names with similar pronunciation would change the rankings,” the ONS said. Compared with 2005, Oscar and Noah showed the biggest increase in popularity for those in the top 10 – rising 45 and 44 places respectively. Oliver and Amelia remained the most popular baby names in 2015 in all regions of England except London and the West Midlands where Muhammad was the top name. Ella and Mia rose into the top 10 girls’ names, replacing Lily and Sophie from 2014, while Noah replaced James in the top 10 boys’ names, the Office for National Statistics said. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.