Caelum is the Latin word for "sky" or "heaven", and it is also the name of a small southern constellation, where the word is the Latin term for a sculptor's chisel. As a given name it belongs to the recent wave of celestial names such as Orion and Atlas, and sounds like Callum. Caelum is still rare in the United States: it rose from number 3799 in 2015 to number 1793 in 2018 and reached number 1690 in 2025, its best rank yet.