Name Guillén Gender Masculine Usage Medieval Spanish, Spanish (Modern), Aragonese, Galician (Rare) Pronounced Pron. /ɡi.ˈʎen/(Spanish) /ɡi.ˈʝen/(Spanish) Edit Status Status3. usages AND description are verified Meaning & History Aragonese form of William and Galician variant of Guillerme as well as a medieval Spanish form of Guillermo which was revived in the early 2000s.