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Across the world, Poisson (Poisson , Pichon , 波森 ) is quite a rare epicene first name. The first name Poisson is characteristic of Algeria, where it is quite a rare unisex name, the Dominican Republic, where it is quite a rare boy's name, and Tunisia, where it is a rare unisex name. Measured by absolute frequency, it is commonest in Algeria, the Dominican Republic, and France. Much more prevalently, Poisson is the last name as well as the forename.
Poisson is also a name for the fictitious and mythical characters: Poisson , the operatic character in the opera Adriana Lecouvreur by Francesco Cilea.