Deuce is an English word name that means "two" or "second", from the Old French deus, and it is used for the two in cards and dice and for a tied score in tennis. In the United States it has long been a nickname for a boy who is the second to carry his father's name, a junior, and only recently has it appeared on birth certificates. Deuce has risen from number 9923 among US boys in 2016 to number 2806 in 2025, its best rank to date.