Cortney is of English origin and means 'short nose'. It's a variant spelling of Courtney, which was originally an English surname derived from the name of an estate in Norfolk called 'Courtney'. The name Cortney gained popularity as a given name for girls in the United States during the late 20th century. It has since become a unisex name, with both boys and girls being named Cortney.
"Cortny peaked in popularity between 1988 and 1991, with a high of 20 births in 1991. After that, its usage gradually declined, reaching a low of 5 births in both 1999 and 2000."