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.
When either Taurus or Libra ascend in women's nativities, and Mars therein, the native will be immodest and unchaste; the same if Capricorn shall ascend. - William Lilly (1602.-1681.)