Aírton is a Portuguese given name, predominantly found in Brazil, whose origins are surprisingly English. The name likely derives from the small village of Airton in North Yorkshire, England. The village name itself means "settlement on the River Aire," with the river name Aire being of ancient Celtic origin. Alternatively, Aírton may be directly taken from the English surname Ayrton, which originated from the same place name.
In Portuguese, the spelling Aírton typically includes an acute accent on the i, reflecting the pronunciation stress on the second syllable — a common adaptation in Portuguese orthography for loanwords. The name gained popularity in Brazil from the 1930s onward, though the exact reason for its adoption as a given name remains unclear. It may have been introduced via English immigrants or through the influence of notable figures bearing similar names.
The related form Ayrton is the English variant, most famously borne by the legendary Brazilian Formula One racing driver Ayrton Senna (1960–1994), whose surname was Senna but whose given name is the English spelling. In Portuguese-speaking contexts, the spelling Aírton emphasizes the Portuguese pronunciation and avoids English orthography.
The use of a geographically English name in Brazil reflects a broader trend in the country of adopting foreign-sounding or classically elegant names, especially during the early 20th century when such names were seen as modern and sophisticated.