...it can also be thought of in the other definitions of the actual word "halcyon," which are in addition to the bird,
-an adjective describing the halcyon -calm and peaceful -the two weeks (seven days preceding and seven days following) the shortest day of the year, based on the superstition that this is a time of calm weather during the brooding time of the halcyon.
(Cool that the previous descriptions are linked with that one, eh?)
According to legend, a halcyon's nest floats on the sea, so the bird is seen as both a harbinger and symbol of calm weather, peace, and security.
Just as Halcyone is the legendary equivalent to Alcyone, the words "alcyon" and "halcyon" can be used interchangeably.
I like the name Alcyone, because of its history and legend and many associations with peace.