Cal, of Latin origin, means "to shout" or "challenge". This masculine given name has been popular throughout history, often associated with the Roman god Jupiter's messenger, Mercury, who was also known as Calumet in some cultures. In ancient Rome, Cal was a common slave name and later became used as a freeborn name. It is still used today, though it may be considered somewhat uncommon in many English-speaking countries.
"In 1954 and 1955, there were a total of 10 babies named Cal."