History of the star: A star in Carina the Keel of the Ship Argo. Miaplacidus, Maia-placidus, the meaning and derivation of which I cannot learn, unless it be in part, as Higgins asserts in his brief work on star-names, from Miyah, the plural of the Arabic Ma, Water. The original, however, is better transcribed Mi'ah.

Beta lies in the Carina subdivision of Argo and is the alpha star of Halley's Robur Carolinum.

[Star Names, Their Lore and Meaning, Richard Hinchley Allen, 1889]. 

No myths or interpretations are associated with the constellation Carina because it was not visible to the ancients in the northern hemisphere, and it had always been seen as part of the constellation Argo Navis, the Great Ship, until French astronomer Nicolas Louis de Lacaille in 1752 subdivided Argo Navis into Carina (the keel of the ship), Puppis (the poop), and Vela (the sails), plus a subordinate division of Argo now called Pyxis Nautica.