Note on the data: I calculated absolute rises and falls by subtracting the number of births in the name's least popular year from the number of births in the name's most popular year. I calculated proportional rises and falls by dividing the number of births (corrected for the annual birthrate) in the name's most popular year by the number of births (corrected for the annual birthrate) in the name's least popular year. I discuss these trends in more detail in a Guardian article. If you would like to do your own analysis of the data, you may wish to see the ONS's raw data and the script I used to calculate these trends. Please do get in touch with feedback.
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NB: The ONS only counts names given to three or more babies in a year - so very unusual names may not appear here.
Type names that interest you in the box on the left-hand side, then watch the graph change. Move your mouse over the graph to see year-on-year numbers and rankings. To find interesting and unusual names, try typing one letter at a time, then explore the graph and the grid - e.g. see all names beginning with I.
Does it show every single name registered in England & Wales? I know a Gandalf who isn't listed here!
Not quite - the ONS doesn't record names that are given to only one or two babies in a year (so no Gandalfs).