no, it's always surname.

the modern spelling is surname sirname is an old spelling but sirname makes more sens,' and surname is pronounced more like sirname anyway

Hey Halbert, In English the word is always "surname" - This is the hereditary name passed from a man to his wife and children, it is a very old tradition in Britain. Be cautious about using the internet to define words there are a lot of people that cannot spell properly. The nouns 'sir' and 'name' do not equal 'surname' the words have different meanings and origins.

A lot of English words come from French as it was the language of Henry 8th court. The French is SURNOM