All around the world, גייגר (Geiger 
, Giger , גייגר 
) is a rare largely masculine, but infrequently feminine given name. The forename גייגר is habitual in Switzerland, where it is a rare gender-neutral name, Peru, where it is a rare masculine name, and Philippines. Predominantly, גייגר is the last name as well as the forename.
גייגר is also a name for the fictitious and mythical characters: Geiger , the fictional character in Marvel Comics.