Eugen von Daday explained

Eugen von Daday or Jenő von Daday (1855 - 1920) was an ethnic Romanian professor of zoology in Hungary in the late 19th and early 20th century.^{[1] [2] [3]} Daday was an expert on aquatic invertebrates, particularly crustaceans.^[4] Daday collected and identified many species and genera within the borders of the Hungarian empire, and received samples of invertebrates from collectors around the world.^[4] After his death in 1920, Daday's collection of crustaceans was acquired by the Hungarian Natural History Museum.^[4]

References

• Book: Entz. B.. Lukács. D.. 1987. Dr Jenö Daday de Deés and the Hungarian hydrobiological research. L. Forro . D.G. Frey. Cladocera: Proceedings of the Cladocera Symposium, Budapest 1985. Developments in Hydrobiology. 35. 1–3 . 978-94-010-8292-1. 10.1007/978-94-009-4039-0_1. Springer Netherlands.

Notes and References

1. Appointments . The American Naturalist . 1903 . 37 . 437 . 361–364 . 10.1086/278304.
2. Book: Eighth International Workshop on Agglutinated Foraminifera . Grzybowski Foundation . 2008 . Romania . 28 . 9789736106521 . Sorin Filipescu, Michael Anthony Kaminski.
3. Faunistical research on the chilopods of Hungarian Lower Mountains . Dányi, László . Norw. J. Entomol . November 2006 . 53 . 271–279.
4. In memoriam Jenő Daday . Forró, L. . Miscellanea Zoologica Hungarica . May 1982 . 1 . 7–10.