Why is the ninth month called September?
1890 (attested from 1860 as a foreign word), from Swahili, literally "journey, expedition," from Arabic, literally "referring to a journey," from safar "journey" (which itself is attested in English as a foreign word from 1858). Used from 1920s of various articles of clothing suitable for safaris.
ON-line text editing system by MITRE Corporation.
Sammet 1969, p.685.