FYI - Earth, Air, Fire & Water: A Carnival of Etymologies

"... Unlike the case with "fire" and "water," the common ancestor of the Indo-European languages seems to have lacked a common word for "air." Air is, after all, a more elusive substance than fire and water, and so it may not have figured as powerfully in the imaginations of our Stone Age ancestors, who seem to have had a religious reverence for fire and water.

Instead, words for "air" in modern Indo-European languages tend to be associated with wind, brightness, sky...."

Carnival of Etymologies