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Surname Sei (Sei
, سي
, セイ
, along with others...) , in all the world, is a common cognomen. The cognomen Sei is habitual in South Korea, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Japan. Measured by absolute frequency, it is commonest in South Korea, Japan, and India. Also, Sei is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sei | Myanmar, Malaysia, India, Japan, Ghana |
| سي | Egypt, Sudan, Syria, Algeria, Morocco |
| セイ | Japan |
| Сей | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Сеи | Russia |
| 왕 | South Korea |