Will Ferrell and Colin Farrell are not related. Will Ferrell is an American actor, comedian, writer, and producer, best known for his work on Saturday Night Live and in comedic films such as Elf, Anchorman, and Step Brothers.

Colin Farrell, on the other hand, is an Irish actor known for his dynamic performances in a variety of film genres, including Tigerland, Minority Report, In Bruges and True Detective.

Will Ferrell is of English, Scottish, and Irish descent, while Colin Farrell is from Castleknock, Dublin, Ireland. Will Ferrell was born in 1967 in Irvine, California, while Colin Farrell was born in 1976 in Castleknock, Dublin, Ireland.

In addition to their different nationalities, the two actors have also had distinct career paths. Will Ferrell is primarily known for his comedic roles, while Colin Farrell has had a more diverse career, taking on roles in both comedic and dramatic films.

Will Ferrell is also known for his work as a writer and produce and has created several successful comedy shows and films, while Colin Farrell has focused more on acting.

In conclusion, Will Ferrell and Colin Farrell are not related. They are two separate actors with different backgrounds, nationalities and career paths, despite sharing the same last name.