'auspicy' originates from Latin, specifically the word 'auspicium', where 'auspex' referred to 'one who observes birds' (a bird-seer) used for taking omens.

'auspicy' changed from Latin 'auspicium' into Late Latin/Old French and then into Middle English forms such as 'auspice' and the rare variant 'auspicy', eventually surviving chiefly as the modern 'auspice/auspices'.

Initially it meant 'the practice of interpreting omens from birds' (divination), but over time it broadened to include 'an omen or token' and further to 'patronage or support' in modern usage.