Etymology
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guppy (n.)

1918, so called about the time they became popular as aquarium fish, from the scientific name (Girardinus guppii), which honored R.J.L. Guppy, the British-born Trinidad clergyman who supplied the first specimen (1866) to the British Museum. The family name is from a place in Dorset. Other early popular names for it were rainbow fish and million fish. The class of streamlined U.S. submarines (1948) is an acronym from greater underwater propulsion power + -y.

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Definitions of guppy

guppy (n.)
small freshwater fish of South America and the West Indies; often kept in aquariums;
Synonyms: rainbow fish / Lebistes reticulatus
From wordnet.princeton.edu