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English word buoyancy comes from English -cy, English buoyant (Having buoyancy; able to float. Lighthearted and lively.)
-cy (English)
(non-productive) Used to form nouns of rank or office e.g. abbacy. (non-productive) Used to form nouns of state, condition or quality e.g. obstinacy.
buoyant (English)
Having buoyancy; able to float. Lighthearted and lively.
buoyancy (English)
(by extension) Resilience or cheerfulness.. (physics) The upward force on a body immersed or partly immersed in a fluid.. The ability of an object to stay afloat in a fluid.