Ava's origin is genuinely debated, with roots traced variously to the Latin avis ("bird") and Hebrew associations with life or breath. Both threads point toward something airy and animating rather than heavy or fixed. The name is often understood as evoking lightness and vitality, a sense of motion rather than permanence.
The Scribe should be asked for manifestation of the hidden, study of mysteries, unfastening of the tongue, circulation of wealth, defamation and transmission of slanders. - Picatrix (Andalusia, ~1000.AD)