Surname Дои (Toshitake 
, Toshisuke , Doi 
, and others...) , worldwide, is a common last name. The cognomen Дои is habitual in Myanmar, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Japan. In absolute terms, it is commonest in Myanmar, Japan, and India. More prevalently, Дои is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Toshitake | Japan, China, Singapore, United States, Brazil |
| Toshisuke | Japan, Brazil, United States |
| Doi | Japan, United States, India, Myanmar, Brazil |
| Toshitsune | Japan, Germany, United States |
| Toshitomo | Japan, France, Brazil |
| Toshisato | Japan |
| Дои | Russia |