
1) Constellation 2) Latin boy name
Found on
https://www.crosswordclues.com/clue/caelum

Latin, meaning: sky, heaven.
Found on
http://archives.nd.edu/ccc.htm

Due to its small size and location away from the plane of the Milky Way, Caelum is a rather barren constellation, with few objects of interest. The constellation`s brightest star, Alpha Caeli, is only of magnitude 4.45, and only one other star (Gamma1 Caeli) is brighter than magnitude 5. Other notable objects in Caelum are RR Caeli, a binary star....
Found on
http://en.wikipedia.org/wiki/Caelum
(abbr. Cae, gen. Caeli) The Sculptor`s Chisel; a very small and obscure southern constellation that lies between Columba and the southern part of Eridanus. Its brightest star is Alpha Cae (visual magnitude 4.44, absolute magnitude 2.92, spectral type F2V, distance 66 light-years...
Found on
http://www.daviddarling.info/encyclopedia/C/Cae.html

English name: The Graving Tool. Genitive name: Caeli. Visibility: Parts visible from the UK. See TABLE 20: THE CONSTELLATIONS.
Found on
http://www.encyclo.co.uk/local/20448

[
n] - a constellation in the southern hemisphere near Columba and Eridanus
Found on
http://www.webdictionary.co.uk/definition.php?query=Caelum
noun a constellation in the southern hemisphere near Columba and Eridanus
Found on
https://www.encyclo.co.uk/local/20974

sky, heaven.
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.