Origin of aphidfrom Modern Latin aphis (pl. aphides); first applied by Linnaeus probably from MGr, misreading of Classical Greek koris, a bug
Origin of aphidNew Latin Aphis Aphid- type genus, coined by Carolus Linnaeus perhaps as a back-formed singular Aphīs from plural Aphīdes irregularly derived from Greek apheideis plural of apheidēs unsparing, unmerciful, lavish (in reference to the damage caused by aphids or to their high reproductive rate) a- not ; see a- 1. pheidesthai to spare, be merciful, live thriftily ; see bheid- in Indo-European roots.
Modern Latin aphides, coined by Swedish botanist Carolus Linnaeus in 1758. His inspiration for the name remains unclear. OED suggests a connection to Ancient Greek αφειδής (apheidēs, “unsparing, lavishly borrowed”) in reference to the insects' voracity or rapid rate of production.