The name Mylash has Slavic origins and is masculine. It is formed from the adjectival root "Myl-" (which means 'dear' or 'nice') with the affectionate suffix "-ash."
The earliest list of personal names that includes the name Mylash contains variants such as Lawrin, Myłasz, and Myszka, dating back to 1565. In 1600, a Cossack named Mylash Ivanenko from Kharkiv is mentioned. In 1609, the name Mylash Vasutyński is also recorded in historical documents.
In the Register of the Zaporozhian Army from 1649, 13 Cossacks with the name Mylash are noted. Among them are Cossack Mylash Petrenko from the Chyhyryn regiment, Cossack Mylash Ustatiy from the Korsun regiment, as well as Cossacks Mylash Arsen and Mylash Yuschenko from the Bratslav regiment, and Cossack Mylash But from the Kaniv regiment.
This name very early began to form patronymics. For example, in 1649, Cossack Lukyan Mylashenko from the Bratslav regiment and Cossack Nychipor Mylashenko from the Korsun regiment are mentioned. The name Mylash, in addition to Ukrainians, has also been used by Serbians since the 14th century and continues to be used today.