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Cranes are a type of large bird with long legs and necks in the biological family Gruidae of the order Gruiformes.
The family name Gruidae comes from the Latin word grus meaning "crane".

The Gruiformes are an order containing a considerable number of living and extinct bird families, with a widespread geographical diversity. Gruiform means "crane-like": from Latin gruem, accusative of grus (“crane”).

L'ordre des Gruiformes est un ordre d'oiseaux qui se caractérisent par leur bec long et pointu et l'absence de jabot. 

Gruiformes, Gruidae: Ce mot latin grus qui signifie "grue".

The Heliornithidae are a small family of tropical birds with webbed lobes on their feet like those of grebes and coots. The family overall are known as finfoots, although one species is known as a sungrebe.

The avian family Rallidae, also known as rails, is a large, cosmopolitan family of small to medium-sized terrestrial and/or semi-amphibious birds of the order Gruiformes.
The family includes such ubiquitous species as the crakes, coots, and gallinule.
"Rail" is the anglicized respelling of the French râle, from Old French rasle. It is named from its harsh cry, in Vulgar Latin *rascula, from Latin rādere ("to scrape").