Family name Сінклер (Sinclair 
, Sinkler 
, Сінклер 
) , across the world, is a common last name. The cognomen Сінклер is characteristic of Jamaica, where it is a common surname, Isle of Man, where it is quite a common surname, and New Zealand (explore the name in all countries). Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Australia. Very seldom, Сінклер is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinclair | United Kingdom, Jamaica, Australia, United States, Canada |
| Sinkler | United Kingdom, France, United States, Canada, New Zealand |
| Сінклер | Ukraine |
St. Claire, Синклер, and סינקלייר