Throughout the world, 習 (Си 
, 習 , Xí 
) is a rare unisex forename. The first name 習 is habitual in Armenia, where it is quite a rare male name, Kazakhstan, where it is a rare male name, and Vietnam, where it is a very rare largely female, but uncommonly male name. Measured by absolute frequency, it is the most numerous in Kazakhstan, Vietnam, and China. More prevalently, 習 is the last name as well as the forename.
習 is also a name for the fictitious and mythical characters: C.C. , the fictional character from Code Geass; JC Denton , the character in Deus Ex video game; C.J. Garrison , the fictional character, The Bold and the Beautiful; C.J. Barnes , the character from 8 Simple Rules and C.D. Parker , the television character on 'Walker, Texas Ranger', among other works.