Family name Ото (Otto 
, Oto 
, Цей 
) , throughout the world, is a widespread surname. The surname Ото is habitual in Antigua and Barbuda, where it is a common surname, Liechtenstein, where it is quite a common surname, and Germany (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Germany, the United States, and South Africa. More prevalently, Ото is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Otto | Germany, Japan, Guatemala, United States, Brazil |
| Oto | Germany, Czechia, Guatemala, United States, Brazil |
| Цей | Kyrgyzstan, Kazakhstan, Russia, Ukraine |
| Ото | Russia, Kyrgyzstan, Serbia, Bulgaria, Ukraine |