Cognomen ใจอักษร (Letter 
, ใจอักษร 
) , across the world, is quite a rare last name. The surname ใจอักษร is habitual in Western Europe, particularly Switzerland, where it is quite a rare surname, Belgium, and Netherlands. Measured by absolute frequency, it is the most numerous in the United States, Myanmar, and Switzerland. Much less frequently, ใจอักษร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Letter | Switzerland, Belgium, United States, Myanmar, Germany |
| ใจอักษร | Thailand |