The number of people in Britain with surnames like Cockshott, Balls, Death and Shufflebottom -- likely the source of schoolroom laughter -- has declined by up to 75 percent in the last century.

A study found the number of people with the name Cock shrank to 785 last year from 3,211 in 1881, those called Balls fell to 1,299 from 2,904 and the number of Deaths were reduced to 605 from 1,133.

People named Smellie decreased by 70 percent, Dafts by 51 percent, Gotobeds by 42 percent, Shufflebottoms by 40 percent, and Cockshotts by 34 percent, said Richard Webber, visiting professor of geography at King's College, London.

"If you find the (absolute) number goes down, it's either because they changed their names or they emigrated," Webber, author of the study, told Reuters on Wednesday.