In the entire world, קייסי (Casey 
, Kasey 
, Kejsi 
) is a widespread unisex forename. The forename קייסי is characteristic of the United States, where it is quite a common epicene name, Albania, where it is quite a common dominantly female, but infrequently male name, and Australia (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, Australia, and the United Kingdom. Likewise, קייסי is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Casey | Australia, Canada, Ireland, United Kingdom, United States |
| Kasey | Australia, Canada, New Zealand, United Kingdom, United States |
| Kejsi | Germany, Albania, Italy, United Kingdom, United States |
| קייסי | Israel |
קייסי is also a prevalent name for the fictitious and mythical characters: Casey Jones , the fictional Teenage Mutant Ninja Turtles character, Teenage Mutant Ninja Turtles: Out of the Shadows; Casey Jones , the fictional Teenage Mutant Ninja Turtles character, created for the film script ''The Blue Door''; Casey Jones , the fictional character in the 1990–2007 Teenage Mutant Ninja Turtles film series; Casey Jones , the fictional character in the 1987–1996 Teenage Mutant Ninja Turtles animated television series, The Manhattan Project, Part 1 and Casey Jones , the fictional character in the Platinum Dunes Teenage Mutant Ninja Turtles film series, Teenage Mutant Ninja Turtles: Out of the Shadows, and in many other works.