Cognomen Ikaku (Ikaku 
) , all over the world, is quite a rare last name. The last name Ikaku is habitual in Japan, where it is quite a rare surname, Tanzania, where it is a rare surname, and Nigeria, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Japan, Tanzania, and India. Much less frequently, Ikaku is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ikaku | India, Japan, Nigeria, Tanzania |