Wilian is a variant of William, from Germanic elements meaning will, desire, and helmet or protection.
Wilian is a Romance-language variant of William, most strongly associated with Brazilian Portuguese and Spanish-speaking communities, where it appears as a genuine and independently beloved name rather than a mere misspelling. William itself descends from the Old High German "Willahelm," a compound of "wil" (will, desire, determination) and "helm" (helmet, protection) — making its original meaning something like "resolute protector" or "guardian with purpose."
Introduced to England by the Norman Conquest in 1066, William became one of the most dominant names in English history, borne by four kings and countless nobles, scholars, and artists. In Brazil, Wilian (sometimes also spelled Willian) became common through the blending of English-influenced naming fashions with Portuguese phonology, where the double-L is often reduced and the ending simplified. The Brazilian footballer Willian Borges da Silva — known simply as Willian — who played for Chelsea, Arsenal, and the Brazilian national team, brought significant visibility to the spelling in the 2010s, making it feel athletic, confident, and distinctly Brazilian.
Wilian thus sits at a fascinating linguistic crossroads: it retains the deep Germanic heritage of determination and protection that made William endure for a thousand years, while its spelling announces a specifically South American or Iberian identity. It is a name that crossed the Atlantic, shed its English coat, and emerged looking somewhat different but carrying the same essential character — a pattern that describes a great many things about the cultures that gave rise to it.