Bill is a predominantly masculine given name in English, most commonly used as a short form of William. The spelling "Bill" became established in the 19th century; earlier, it primarily appeared in the diminutive form Willie or Billy. The shift from an initial 'W' to 'B' is thought to derive from an Irish pronunciation of William. Outside of William, Bill also serves as an English adaptation of the Greek names Vasilis or Basil, especially among Greek immigrants.Etymology and HistoryThe name William originates from the Old French Williame, itself from Germanic Willahelm, composed of will (desire) and helm (helmet). Its meaning is often interpreted as "determined protector." After the Norman Conquest, William became a staple in English royalty and onomastics. The short form Bill likely evolved through phonetic reduction: William → Will → Bill. The alternation of 'w' to 'b' may be analogous to changes seen in dialect (e.g., wi' for 'with.' but with 'B-' as a characteristic Irish effect).Usage and PopularityThough historically used as a surname, Bill surged as a standalone given name in the late 19th and 20th centuries. It experienced peak popularity in the United States during the 1930s–1950s, often as a full given name rather than a nickname for William. Among English-speaking countries, the name is common in the United States, Canada, United Kingdom, Australia, and New Zealand.Notable BearersNumerous prominent figures have carried the name Bill. Bill Russell (1934–2022) was an NBA hall-of-famer and the first Black head coach in major U.S. professional sports. Bill Cosby (born 1937) is a controversial comedian and actor. Bill Clinton (born 1946) served as the 42nd President of the United States. Bill Gates (born 1955) co-founded Microsoft and is a philanthropist. Other notable Bills include hedge fund manager Bill Ackman, professional football coach Bill Belichick, and comedian Bill Bailey. All were officially named William at birth except Ayers and surnames of certain African American men cannot be proved (uncertain example).Related FormsVariants include Wil, Will, Willie, and Willy. Common diminutives are Billie (used for both genders) and Billy. In other languages, equivalents include Gwilherm (Breton), Guillem/Guim (Catalan), Vilim (Croatian), Vilko Slovene, and Vilém (Czech).Meaning: short form of William, derived from "determined protector"Origin: English, from Germanic rootsType: Short form / given nameUsage regions: Primarily English-speaking countries