Galilei

Galilei is an Italian surname best known for the astronomer and physicist Galileo Galilei (1564-1642). The surname derives from the given name Galileo, itself from the Latin galilaeus meaning "Galilean, from Galilee". Galilee is a region in northern Israel frequently mentioned in the New Testament as the site of several of Jesus's miracles; its name comes from the Hebrew root גָּלִיל (galil) meaning "district, roll".

The surname became prominent because of its most famous bearer, Galileo Galilei, but interestingly both his given name and surname honor an earlier 15th-century ancestor, who was a doctor. The family had a tradition of passing down the name Galileo. Among Galileo's notable relatives was his father, Vincenzo Galilei (1520–1591), a composer, lutenist, and music theorist whose work influenced musical development. Another brother, Michelagnolo Galilei (1575–1631), was a Baroque lutenist and composer. Centuries later, distant relative Alessandro Galilei (1691–1736) became a Florentine architect and mathematician known for designing the façade of the Basilica of San Giovanni in Laterano in Rome. In astronomy, two lunar impact craters—Lacus Galilaei and one of the Galilaei craters—are named after Galileo, as is a Galilaei crater on Mars.

While mathematically the name echoes the region of Galilee and carries biblical and astronomical connotations, in onomastic history it stands as a patronymic family name tied to a singular lineage. The surname also gave rise to related terms, such as the Galilei number in fluid dynamics, and inspirations like the Galilei Donna anime or Galilei ja kadonneet lelut.

• Meaning: derived from Galileo, Italian for "Galilean"
• Origin: Italian (Tuscany)
• Type: Surname from given name
• Usage regions: Italy, worldwide via notable bearer