Worldwide, Regel (Regula 
, Regel 
, Reegel ) is quite a common unisex forename. The first name Regel is habitual in Switzerland, where it is quite a common female name, Tanzania, where it is quite a rare feminine name, and Philippines, where it is a rare gender-neutral name. Measured by absolute frequency, it most frequently occurs in India, Switzerland, and Philippines. Also, Regel is the last name as well as the forename.