Guido
A surname that usually comes from the medieval personal name Guido, the Latinized form of Guy/Wido.
The #4,971 most common surname in the United States (2010 Census) — about 1 in every 43,682 Americans shares it.
Etymology
This surname is generally understood as coming from the medieval given name Guido, a Latinized form used in Norman and medieval records. The personal name is closely tied to Guy and Wido/Wydo, with older writers sometimes connecting it to Latin Gaius/Caius or to Celtic forms, though that deeper origin is not certain. In surname use, it typically meant 'son of Guido' or simply identified someone by an ancestor bearing that name.
History
The name appears in medieval English and Norman records, especially in forms like filius Widonis, showing its use as a hereditary family name from a personal name. It also spread through Norman channels into English surname tradition, with related forms such as Guy, Wido, Wydo, and Widowson appearing in older sources. Modern Guido may also reflect direct use of the Italian and continental given name, especially in immigrant families.
Origin
Regions
Variant spellings
Fun fact
In some medieval English records, Guido appears in Latinized forms like Widonis, which can make it look much more exotic than it was in everyday speech.
From the historical record
“name cp. O.Ir. tdin, tdn, water] Guido de Tanton. — Hund. Rolls (Soms.). tapIsIrI'-t^p'^^^)^"'”
— Surnames of the United Kingdom: a concise etymological dictionary (2 vols in 1)