Family name Клей (Clay 
, Kley 
, Klei 
) , all around the world, is a common last name. The surname Клей is characteristic of Isle of Man, where it is quite a common surname, the United States, and the United Kingdom, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Germany. Also, Клей is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Clay | United Kingdom, Germany, Australia, Indonesia, United States |
| Kley | United Kingdom, Germany, Australia, United States, Democratic Republic of the Congo |
| Klei | United Kingdom, Germany, Australia, United States, France |
| Клей | Kyrgyzstan, Ukraine, Russia |
Анна, Василь, Віктор, Лариса, Оксана, Руслан, Михайло, Розалія, Дмитро, Руслана, Анатолій, Василина, Світлана, Ярослава, Валентина, Володимир, Владислав, Ярослав, Олександр, Галина, Касиус, Віра, Евен, Юлія, Юзик, Юрій, Кітті, Артем, Максим, Артём, Павло, Вадим, Любов, Олена, Софія, Уляна, Ірина, Ганна, and Станіслав