Cognomen อิชิอิ (Ichii 
, อิชิอิ 
) , in the entire world, is a rare last name. The surname อิชิอิ is habitual in Switzerland, where it is a rare surname, Thailand, where it is a very rare surname, and Indonesia. Measured by absolute frequency, it is the most numerous in Indonesia, Brazil, and Thailand. Much more prevalently, อิชิอิ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ichii | Switzerland, Brazil, Indonesia, Japan, China |
| อิชิอิ | Thailand |