Family name Gwilym (Willame 
, Gwilym 
, Willahelm ) , in the entire world, is quite a rare cognomen. The surname Gwilym is habitual in Belgium, where it is quite a rare surname, France, where it is a rare surname, and New Zealand. In absolute terms, it is commonest in Belgium, France, and the United Kingdom. More frequently, Gwilym is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Willame | France, United States, Brazil, Belgium, United Kingdom |
| Gwilym | Australia, Japan, France, United States, United Kingdom |
| Willahelm | United States |
Bill, Guglielmo, Guilherme, Guillaume, Guillem, Guillermo, Guillén, Gulielmus, Gwyllym, Vilem, Viljem, Vilmos, Vilém, Wilhelm, Wilhelm Carl, Wiliam, Will, Willem, William, Wm., Μπιλ, Бил, Билл, Біл, Білл, Вил, Вилем, Вилл, Виллем, Вилмос, Вилмош, Вилхелм, Вильгельм, Вильем, Вильмош, Вильям, Вилям, Вілем, Вільгельм, Вільмош, Вільям, Гийом, Гильен, Гильерме, Гильермо, Гійом, Гільєрмо, Уилл, Уильям, Уилям, Уільям, ביל, גיום, ווילהעלם, וויליאם, וילהלם, ויליאם, וילם, بيل, ولیم, ويل, ويليام, ويليم, ویلیام, উইলিয়াম, বিল, ウィリアム, ウィル, ウイリアム, ギョーム, ギヨーム, ビッグ, ビル, 吉恩, 吉拉姆, 威尔, 威廉, 比尔, and 維倫
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dafydd ap gwilym Welsh poet, GB (b. 1320) |
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eurfyl ap gwilym Welsh economist (born 1944), GB (b. 1944) |
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mike gwilym British actor, GB (b. 1949) |
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tich gwilym British musician, GB (b. 1950) |
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meinir gwilym Welsh singer, GB (b. 1983) |
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| arfon gwilym Welsh singer, GB (b. 1950) |
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| lowri gwilym Welsh radio and television producer (1954-2010), GB (b. 1954) |
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| robert gwilym British actor, GB (b. 1956) |
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| lisa gwilym Welsh broadcaster, GB (b. 1975) |
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| thomas gethin ap gwilym Peerage person ID=609968 |
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| dafydd ap gwilym Peerage person ID=609970 |
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| henry ap gwilym Peerage person ID=412630 |
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| madog ap gwilym Peerage person ID=568072 |
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| hywel ap john ap hywel ap gwilym - Abt 1564 |
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| alice verch gwilym Peerage person ID=610584 |
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