Cognomen Ĉu (Чи 
, Czy 
, Ĉu ) , around the globe, is a rare surname. The surname Ĉu is habitual in Kyrgyzstan, where it is a rare surname, Poland, and Kazakhstan. Not in comparison with a country's population, this name is the most popular in Russia, Poland, and Myanmar. Also, Ĉu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Чи | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Czy | Singapore, Myanmar, Poland, China, Germany |
| Ĉu | Myanmar |