Jack and Sophie were the most popular babies' names registered in 2009, the latest statistics from the Central Statistics Office show.
Jack retains the top position it held in 2007 and 2008, while this is the first time Sophie has taken the number one spot, climbing from sixth in 2008.
There were 1,061 boys named Jack in 2009, 134 more than the number of boys named Sean, the second most popular name.
There were 635 girls named Sophie, but this was only five more than the number of girls named Ava, the second most popular girls' name.
The top five boys' names (Jack, Sean, Daniel, Conor and James) also made up the top five in 2007 and 2008. Four of the top five boys' names (Jack, Sean, Conor and James) have been in the top five since 1998, with only their order changing from year to year.
Daniel entered the top five at number four in 2007 but had been ranked sixth from 2002 to 2006.
There has been more variation in the girls' top five. While Emma and Sarah have been in the top five since 1998, this is the first time Grace has appeared in the top five. Ava entered the top five in 2008 and Sophie has been in the top five twice since 1998 - in 2006 and 2007.
There were three first time entries to the top 100 for boys: Bobby, Shay and Szymon. The highest new entry at number 85 was Bobby, which rose from 109th place in 2008.
The names rising most in popularity in the year were Szymon and
Lucas, up 30 and 25 places respectively.
There were six first time entries to the top 100 for girls: Layla, Oliwia, Hollie, Madison, Daisy and Emilia. The highest new entry at number 74 was Layla climbing from 106th place in 2008.
The names climbing most places in the year were Daisy, up 61 places and Hollie, up 48 places.
In general, the tables show that girls are given a wider variety of names than boys are, with 4,816 girls' names registered and 3,924 boys' names registered.
