Dyson
A name most likely meaning “son of Dye,” with Dye as a medieval short form of Denis or a related name.
The #2,984 most common surname in the United States (2010 Census) — about 1 in every 25,692 Americans shares it.
Etymology
Dyson is an English surname built from Dye, an old short form of Dennis/Denis, plus "son." In that sense, it originally meant "son of Dye" or "son of Denis." Older surname scholars also noted that spelling and pronunciation could vary in northern English families, so the name appears in a few closely related forms.
History
The name is especially associated with northern England, where short forms like Dye, Dyatt, Dyett, and Dyson clustered together. 19th-century surname writers also pointed out that "Tyson" could sometimes represent the same family-name pattern through t/d interchange in local speech or spelling. Dyson remained established as a regular hereditary surname and is well known today in Britain and countries shaped by British migration.
Origin
Regions
Variant spellings
Fun fact
Older reference works even mention a Cambridge firm called Death and Dyson, with the second name jokingly pronounced "Dy-soon."
From the historical record
“TYSON I = Tyas's Son : v. Tyas. 2 for Dyson, q.v. TYTE, V. Tite, Titus. TYTHERINGTON, v. Titherington.”
— Surnames of the United Kingdom: a concise etymological dictionary (2 vols in 1)