What is the surname of Frasier's brother?

Frasier's brother has the surname Crane: his full name is Niles Crane. Niles is Frasier's younger brother, and both men are sons of Martin Crane, a retired Seattle police detective, and Hester Crane, a psychiatrist who died before the series begins.

The brothers are both psychiatrists, highly educated, competitive, and devoted to classical music, fine art, and elaborate conversation. Their similarities make them rivals, while their different habits create much of the show's comedy. Frasier is a radio psychiatrist; Niles initially runs a private practice and is notably more anxious and germ-conscious.

The Crane family name connects the central characters across the series. Martin is the practical, working-class father; Frasier and Niles are his sophisticated sons; and later Daphne becomes Daphne Crane after marrying Niles. Niles's son, David, also carries the family surname.

Viewers sometimes confuse Crane with Doyle, but Doyle is Roz's surname. Martin, Frasier, and Niles are all Cranes, while Roz Doyle is the producer of Frasier's radio program and not a member of the family.