Vayu means air.
Vayu is also a Vedic deity, and name of the presiding deity of air. Vayu is represented as a minor God-army called Maruts, who form seven sets of seven each. There are forty nine Maruts in all. They are the younger brothers of Indra.
Vayu in the context of life-breath is referred to as prana. There are five pranas that conduct the human system - prana, apana, vyana, udana and samana.