Helleri

Helleri is a term that can refer to several different things, most commonly a species of fish or a surname.

In ichthyology, helleri refers to Xiphophorus hellerii, commonly known as the green swordtail. This is a freshwater fish belonging to the family Poeciliidae. Native to eastern Mexico, the green swordtail is a popular aquarium fish due to its vibrant coloration and relatively peaceful nature. Males are distinguished by a long, sword-like extension of their lower caudal fin, which gives the species its name. They are livebearers, meaning they give birth to live young rather than laying eggs. The species has been widely hybridized and selectively bred, resulting in a variety of color morphs available in the pet trade.

As a surname, Helleri is of German or Jewish origin. It is likely a variant of the occupational surname Heller, which referred to a coiner or a maker of tinware. Variations of this surname exist across various European countries. Individuals with the surname Helleri are found globally, with notable concentrations in Europe and North America.