Culture · Roman Empire Daily
July and August are named after Julius Caesar and the emperor Augustus.
Deep dive
The month Quintilis was renamed Julius for Caesar, who reformed the calendar, and Sextilis became Augustus in the first emperor's honor. (The myth that Augustus stole a day from February to pad his month is a later, unfounded tale.)
Source: Censorinus, 'De Die Natali,' 22; Macrobius, 'Saturnalia,' 1.12.