Cognomen Макнилл (Mcneill 
, Macneille 
, Макнилл 
) , in the entire world, is a common last name. The cognomen Макнилл is habitual in New Zealand, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Australia. Not in comparison with a country's population, this name is the most popular in the United States, the United Kingdom, and Australia.