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 | Brazil, Guatemala, United States, Japan, Germany |
| Oto | Brazil, Guatemala, United States, Germany, Czechia |
| Цей | Kyrgyzstan, Russia, Kazakhstan, Ukraine |
| Ото | Serbia, Bulgaria, Kyrgyzstan, Russia, Ukraine |