Guglielmo
Meaning
Italian form of William ("will helmet"); famously borne by Guglielmo Marconi, inventor of practical radio transmission
The story
Guglielmo is William in full Italian dress, the same Germanic name built from will and helmet, unrolled across four syllables. It sits in the history books because of Guglielmo Marconi, the Bologna-born inventor who gathered the era's scattered discoveries about electromagnetic waves and engineered them into practical radio, sending a wireless signal across the Atlantic in 1901 and sharing the Nobel Prize in Physics in 1909; within a decade, ships at sea, including the one that raced to the Titanic's survivors, depended on Marconi equipment. For all that fame, the first name never crossed the ocean with it: Guglielmo has stayed a true rarity in American records, showing its first faint presence only in the most recent decade. That leaves it a bold, nearly untouched choice, operatic in sound and anchored to the man who taught the world to broadcast.
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Guglielmo has stayed rare in US records the whole time: no peak decade to name.
See popularity in Brazil
Popularity in Brazil
64 people · the #56,233 first name in Brazil · median age 46
Source: IBGE, Censo Demográfico 2022
The Guglielmo deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Guglielmo truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Guglielmo fits with your family’s names and surname.
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