What is the percent distribution of first letters in last names in the UK?

The distribution of first letters in last names in the UK tends to show a concentration of certain letters, with common initials including S, B, and M. For example, approximately 7-8% of last names start with 'S', followed by 'B' and 'M' at around 6% each. Less common initials, like 'X' or 'Z', make up a very small percentage, often below 1%. Overall, the distribution reflects a diverse range of last names, influenced by cultural and historical factors.