Source Information & Methodology

Source information and methodology for England & Wales in United Kingdom.

Names Data Information
  • Data is sourced from Office for National Statistics .
  • Data is Crown copyright, used by this site under terms of the Open Government Licence .
  • Names data is currently available for the years 1996‑2018.
  • Data is available for names with a count of 3 or more each year only.
  • Names data is derived from final annual births registration data and represents all live births occurring in the specific calendar year.
  • Names with accents have had the accents removed and have been grouped with the equivalent names without accents. For example, the names Chloé, Chloë, Chloè and Chlöe have been grouped with Chloe.
  • Hyphenated names where spaces have been included between the names, for example Amelia‑ Lily, will appear in the statistics as Amelia-.
  • Hyphenated names where the first part of the name was included in the first forename field and the second part in the second forename field rather than all of the name being included in the first forename field, for example, Amelia- is recorded in the first forename field while Lily is recorded in the second forename field, will also appear in the statistics as Amelia-.
  • Exact count data is not available in some years for a small number of names which are popular in Wales but have a low count in England. The names affected are as follows:
  • Names have been converted to ‘proper case’ format, so names with the same spelling but different capitalisation have been grouped. For example, the name McKenzie will have been grouped with Mckenzie. A few names will have a lower-case letter where there should be an upper-case letter. For example, a forename of AJ will appear as Aj.
  • The available names data has been used to produce the following statistics for each name:
    • Rank: The position of a name when the list of names for a given year has been placed in order from highest count to lowest count. Names with an equal count have been given the same rank, and placed in alphabetical order in popularity tables.
    • Change in rank: The difference in ranks of a name between a given year and a previous year.
    • Count: The number of boys or girls given a particular name in a given year.
    • Relative change in count: The relative difference in counts between a given year and a previous year. The relative change is not the actual difference between counts, but gives a better idea of the change from a previous year by taking into account the different total number of births for each year.
    • Percentage of total male/female births: The number of boys or girls given a particular name in a given year as a proportion of the total number of male or female births in that year.
    Relative change in count and percentage of total male/female births statistics are only available for years where number of births data is available.
  • New names data is added to the site when it becomes available, usually around September each year.
Births Data Information
  • Number of female and male births per year data is currently available for the years 1838‑2018.
  • Data is sourced from Office for National Statistics .
  • New births data is added to the site when it becomes available, usually around October each year.