Callaghan is an Irish surname and given name, derived from the Gaelic 'O' Celleachan', which means 'descendant of Celaichan'. The name Celaichan is composed of two elements: 'ceallach', meaning 'strife', and 'án', signifying 'little'. Therefore, Callaghan translates to 'little strife'. It was traditionally a patronymic surname, indicating that it was passed down from father to son. However, in modern times, Callaghan is also used as a given name for boys. Notable individuals with the surname Callaghan include several politicians, such as former Australian Prime Minister Bob Hawke and former Canadian Prime Minister Pierre Trudeau's wife, Margaret Sinclair.
"The name Callaghan experienced a significant surge in popularity from 2018 onwards, with 18 or more births each year since then. Prior to this, the annual number of births fluctuated between 5 and 10."