| FULL FORMS |
| DUTCH: Wilbert, Wilhelmina, Wilhelmus, Willem, Willemijn, Willemina |
| ENGLISH: Wilfred, Wilfrid, William |
|
| EQUIVALENTS |
| ANCIENT GERMANIC: Wilhelm, Willabert, Willahelm, Willifrid |
| ANGLO-SAXON: Wilfrith, Wilfrið |
| BRETON: Gwilherm |
| CATALAN: Guifré, Guillem |
| CROATIAN: Vilim, Vilko, Vilma |
| CZECH: Vilém, Vilma |
| DANISH: Vilfred, Vilhelm |
| DUTCH: Elma, Helma, Jelle, Mien, Mina, Pim, Wil, Willy, Wilma, Wim |
| ENGLISH: Bill, Liam, Wil, Wilf, Will, Willie, Willy |
| ESPERANTO: Vilĉjo, Vilhelmo |
| ESTONIAN: Villem |
| FINNISH: Helmi, Iina, Jami, Miina, Mimmi, Minna, Vilhelm, Vilhelmi, Vilhelmiina, Vilho, Vili, Viljami, Viljo, Ville, Vilma |
| FRENCH: Guillaume |
| GERMAN: Elma, Helma, Helmine, Minna, Vilma, Wilfried, Wilhelm, Wilhelmina, Wilhelmine, Willi, Willy, Wilma, Wim |
| HUNGARIAN: Vilhelm, Vili, Vilma, Vilmos |
| ICELANDIC: Vilhjálmur |
| IRISH: Liam, Uilleag, Uilliam, Ulick |
| ITALIAN: Guglielmo, Vilfredo |
| LATVIAN: Vilhelms, Vilis |
| LIMBURGISH: Mien, Mina, Wöllem, Wullem, Wum |
| LITHUANIAN: Vilhelmas, Vilhelmina |
| MANX: Illiam |
| MAORI: Wiremu |
| MEDIEVAL ENGLISH: Wilmot |
| NORWEGIAN: Vilhelm |
| POLISH: Wilhelm, Wilhelmina |
| PORTUGUESE: Guilherme |
| SCOTTISH: Uilleam |
| SLOVAK: Viliam, Vilma |
| SLOVENE: Vili, Viljem, Vilko |
| SPANISH: Guillermo, Vilma, Wilfredo |
| SWEDISH: Helmi, Mimmi, Minna, Vilhelm, Vilhelmina, Ville, Vilma |
| WELSH: Gwil, Gwilim, Gwillym, Gwilym |
|
| DIMINUTIVES AND SHORT FORMS |
| ENGLISH: Billie, Billy |
| MEDIEVAL ENGLISH: Wilkin, Wilky |
|
| MASCULINE FORMS |
| ANCIENT GERMANIC: Wilhelm, Willahelm |
| BRETON: Gwilherm |
| CATALAN: Guillem |
| CROATIAN: Vilim, Vilko |
| CZECH: Vilém |
| DANISH: Vilhelm |
| DUTCH: Jelle, Pim, Wilhelmus, Willem, Willy, Wim |
| ENGLISH: Bill, Billie, Billy, Liam, Will, William, Willie, Willy |
| ESPERANTO: Vilĉjo, Vilhelmo |
| ESTONIAN: Villem |
| FINNISH: Jami, Vilhelm, Vilhelmi, Vilho, Vili, Viljami, Viljo, Ville |
| FRENCH: Guillaume |
| GERMAN: Wilhelm, Willi, Willy, Wim |
| HUNGARIAN: Vilhelm, Vili, Vilmos |
| ICELANDIC: Vilhjálmur |
| IRISH: Liam, Uilleag, Uilliam, Ulick |
| ITALIAN: Guglielmo |
| LATVIAN: Vilhelms, Vilis |
| LIMBURGISH: Wöllem, Wullem, Wum |
| LITHUANIAN: Vilhelmas |
| MANX: Illiam |
| MAORI: Wiremu |
| MEDIEVAL ENGLISH: Wilkin, Wilky, Wilmot |
| NORWEGIAN: Vilhelm |
| POLISH: Wilhelm |
| PORTUGUESE: Guilherme |
| SCOTTISH: Uilleam |
| SLOVAK: Viliam |
| SLOVENE: Vili, Viljem, Vilko |
| SPANISH: Guillermo |
| SWEDISH: Vilhelm, Ville |
| WELSH: Gwil, Gwilim, Gwillym, Gwilym |
|
| FEMININE FORMS |
| CROATIAN: Vilma |
| CZECH: Vilma |
| DUTCH: Elma, Helma, Mien, Mina, Wilhelmina, Willemijn, Willemina, Willy, Wilma |
| ENGLISH: Mina, Minnie, Velma, Wilfreda, Wilhelmina, Willa, Wilma |
| FINNISH: Helmi, Iina, Miina, Mimmi, Minna, Vilhelmiina, Vilma |
| GERMAN: Elma, Helma, Helmine, Minna, Vilma, Wilhelmina, Wilhelmine, Wilma |
| HUNGARIAN: Vilma |
| LIMBURGISH: Mien, Mina |
| LITHUANIAN: Vilhelmina |
| POLISH: Wilhelmina |
| SLOVAK: Vilma |
| SPANISH: Vilma |
| SWEDISH: Helmi, Mimmi, Minna, Vilhelmina, Vilma |
|
| OTHER FORMS |
| ENGLISH: Liam, Wilkie, Willis, Wilson |
|