In the world, Гійом (Гійом 
) is an extremely rare male first name. Very seldom, Гійом is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Гійом | Ukraine |
Bill, Ghilherme, Giiom, Guglielmo, Guilhem, Guilherme, Guillaume, Guillem, Guillen, Guillermo, Guillén, Gulielmus, Gwilherm, Gwilym, Hiiom, Hijom, Vilem, Vilhelm, Vilhelmo, Viljem, Vilmos, Vilém, Wilhelm, Wilhelm Carl, Wiliam, Will, Willem, William, Williams, Wm., Μπιλ, Бил, Билл, Біл, Білл, Вил, Вилем, Вилл, Виллем, Вилль, Вилмос, Вилмош, Вилхелм, Вильгельм, Вильем, Вильмош, Вильям, Вилям, Вілем, Вільгельм,
Гійом is also a name for the fictitious and mythical characters: Guillaume de Saint-Béryl , character in Complot à Versailles and Guillaume Leserman , character in Plus belle la vie.