The Viktor form of this classic name is widely used throughout Europe and is rising in the US as well.

Viktor

Vincent is a name with a complex image. After being quietly used for centuries, it is suddenly seeming stylish, along wih other V names. Even the nickname Vince has been given a reprieve via actor Vince Vaughn and country singer Vince Gill. Vin Diesel was born with the more prosaic name Mark Vincent.
 Vincent was popular during the Middle Ages, especially among the French, who brought it to England. There are a number of St. Vincents, most famous of whom is St. Vincent de Paul, a seventeenth century French priest who organized societies of laymen to help the poor.
 Vincent has always been a favorite of Roman Catholic families, particularly in the Italian community. Its most notable bearer was Vincent van Gogh, but there also was philanthropist Vincent Astor, who gave it a patrician edge, and actors Vincent Price and Vincent D'Onofrio.
 Vincent/Vince/Vinny has appeared on screen as the central characters of My Cousin Vinny and Entourage. John Travolta had two key Vin-roles: Vinnie Barbarino in the TV series that launched him (Welcome Back, Kotter), and as Vincent Vega in Pulp Fiction. Vincent was the gentle giant on TV's Beauty and the Beast, and Ethan Hawke played a Vincent in Gattaca.

Vincent

William is one of the most enduring of classic names for boys. It's also among the most popular boys' names, as American parents see it as being ideally conservative yet contemporary, and hands-down the most popular <a href="https://nameberry.com/search/boys-names/w">baby name beginning with W</a> of all time. 
 For 400 years, William has been second only to John as the most popular name in the English-speaking world. And now of course, it's also a newsy name—thanks to Britain's high-profile Prince William.
 William is derived from the Germanic name Wilhelm, composed of the elements wil, "will," and helm, referring to a helmet or protection. The name was introduced to England by William the Conqueror, with William being the Norman variation of the name. In Central and Southern France, it was translated as Guillaume.
 
In terms of short forms, yesterday's Bills and Billys have given way to today's Wills—or Williams, with no diminutive—though a few hip Billys, including Helena Bonham Carter and Tim Burton's, have surfaced recently. 
 But Irish spinoff Liam is the most stylish William nickname and has now superseded William, becoming the most popular boy name in America. Riding the William bandwagon is the Dutch Willem, which comes with the unique nickname Pim.
 
William has long reigned as a royal name in the U.K. There are tons of worthy namesakes called William, including William Shakespeare, Bill Gates and four U.S. presidents.

William

Yaxley

jmhieb's list "Harry Potter Names" of 4 great name ideas: Viktor - Yaxley!

Harry Potter Names

If you want to reference your favorite book without being too obvious, I have a few names for you. I warn you some of these are very obscure and others are very ordinary. 

Harry Potter Names

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