Hasner

Hasner is a surname of European origin, commonly found among Ashkenazi Jewish communities and in German-speaking areas. The exact etymology is unclear; it may derive from a place name or from a nickname connected to the German word for hare (Hasen) with a patronymic suffix. The name has several spellings, including Hasner and Hassner.

In medicine, Hasner's valve refers to an anatomical structure at the distal end of the nasolacrimal duct. It is named after the physician who first described it. The valve helps regulate tear drainage as tears pass from the lacrimal sac into the nasal cavity, and it serves to prevent reflux of nasal secretions into the lacrimal system. Obstruction or dysfunction of this region can contribute to nasolacrimal duct blockage and epiphora (watering of the eye).

The surname Hasner has appeared in historical records across Central and Eastern Europe and among Jewish diaspora communities, with bearers who contributed to a variety of professional fields in the 19th through 20th centuries and beyond. Variants and transliterations have emerged through immigration and language changes.