Amerighi is an Italian surname of patronymic origin, meaning "son of Amerigo." The given name Amerigo itself is a medieval Italian form of the Germanic name Emmerich, which blends several possible elements: irmin ("whole, great"), amal ("unceasing, vigorous, brave"), or heim ("home"), combined with rih ("ruler, king"). The best-known bearer of Amerigo is the Florentine explorer Amerigo Vespucci (1451–1512), whose Latinized first name Americus gave rise to the name America.
As a patronymic surname, Amerighi follows the common Italian pattern of adding the suffix -ighi (a variant of -ini) to a personal name, indicating lineage. Such surnames often originated in central Italy, particularly Tuscany, where Vespucci hailed. The surname remains relatively rare but is documented in Italian surname maps and heraldic records.
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Sources: Wiktionary — Amerighi