Demontay is a unisex given name of American origin, derived from combining 'De' and 'Montay', which itself is a variant spelling of the French surname Montague. The name first gained popularity in the United States during the late 20th century.
The name Demontay experienced a peak in popularity between 2002 and 2005 with 16 births in 2002 and over 13 births each year until 2005, after which it gradually decreased to as low as 5 births in recent years.