While the meaning "morning glory (flower)" is correct, Hajnalka is also a diminutive of Hajnal. Here's a photo of a Hungarian Jewish girl officially named Hajnal and wearing a dress with Hajnalka stitched on the sleeve:https://mastodon.world/@auschwitzmuseum/114309778937642475
https://mastodon.world/@auschwitzmuseum/114309778937642475