William has appeared in the U.S. top 20 every single year of the SSA record — from 1880 to 2024. No other boys' name can claim that streak. Four million American Williams have been born in those 144 years, making it one of the most consistently chosen names in the country's recorded naming history.
From Wilhelm to William the Conqueror
The name traces to the Germanic Wilhelm, a compound of wil ("will, desire") and helm ("helmet, protection") — typically rendered as "resolute protector" or "determined guardian." The name entered England with William the Conqueror in 1066, after which it became the single most common name among English-speaking men for nearly a thousand years. By the 13th century, roughly one in four English boys was named William.
That Norman inheritance carried directly into colonial America. Four U.S. presidents have been named William (Henry Harrison, McKinley, Howard Taft, and Bill Clinton, born William Jefferson). The name peaked numerically in 1947, when over 78,000 American boys received it — the largest single-year cohort of Williams in U.S. history.
The nickname problem (and feature)
William has produced more durable nicknames than almost any English-language name: Will, Bill, Billy, Liam, Wills, Wilhelm, Guillermo (in Spanish), Guillaume (in French). Liam — currently the #1 boys' name in America — is itself an Irish hypocoristic of William. In effect, Williams have been topping the U.S. charts under three different names (William, Bill, Liam) across the 20th and 21st centuries.
This nickname optionality is part of why the name has resisted dating. A William born in 2025 can become Will, Liam, or Bill depending on era and personal preference — three different generational coding systems carried inside one birth certificate.
The counter-reading: is William a "safe" choice?
The conventional framing presents William as the ultimate safe, traditional name. The framing flattens what's actually happened in the data. William has been declining steadily since the late 1940s peak, drifting from #2 in 1950 to #10 in 2024. It is more popular relative to other names than it was twenty years ago because the field has fragmented — not because William itself is gaining. Parents naming a William in 2025 are choosing a name that is at its lowest absolute usage in over a century.
This is not a flaw. For families looking for a name with deep continuity rather than current heat, William's slow drift offers exactly that: a name still inside the top 10, still familiar in every English-speaking country, but no longer producing the classroom saturation it did in mid-20th-century America. Its 2020s profile is closer to evergreen than to fashionable.