This is the 7050th most frequent Polish word.
hejmanowskiej
"Hejmanowskiej" is a form of an adjective derived from the proper noun "Hejmanowska," relating to someone or something named Hejmanowska, used in the feminine singular genitive/dative/locative case in Polish.
The word 'hejmanowskiej' is used as an adjective derived from a name, presumably "Heyman" related to a style or cultural influence.
Czy podoba Ci się dekoracja w hejmanowskiej stylu?
Do you like the decoration in the Heymanowska style?
Here, 'hejmanowskiej' is applied to describe the band, indicating its origin or relation to Heyman.
Piosenka hejmanowskiej grupy była bardzo popularna.
The song of the Heymanowska band was very popular.
In this instance, 'hejmanowskiej' is pointing towards a specific manner or method indicative of Heyman's influence.