'Claíomh Solais', meaning 'Sword of Light', is a legendary sword mentioned in Celtic mythology; it is said that no one ever escaped from it once it was drawn from its sheath, and no one could resist it..
This card's English name is derived from the Japanese pronunciation of 'Claiomh Solais' (Kurau Sorasu).
Incidentally enough, 'Claiomh Solais' was a weapon in Konami's 'Castlevania: Aria of Sorrow' and 'Castlevania: Dawn of Sorrow'
Both cards share much of its appearance (including its pose), and the same basis for their names.
Since it's implied that the "Ally of Justice" monsters are adversaries of the LIGHT-Attribute "Worm" archetype, this card's bird-like appearance makes sense because of the "stereotypical" bird's diet (i.e. earthworms).