Around the world, ไข้ (Khai 
, ไข้, Feever) is a common gender-neutral first name. The first name ไข้ is habitual in Mongolia, where it is a common feminine name, Brunei, where it is quite a common predominantly boy's, but very infrequently female name, and Grenada, where it is quite a common boy's name. Measured by absolute frequency, it is commonest in Vietnam, Mongolia, and India. Likewise, ไข้ is the last name as well as the forename.