True. I did a bit of research. I assume it was named after Karl Pfankuch who was a German entomologist (specialising in ichneumon wasps), active during the time where Hylaeus was described.
The etymology for the surname Pfan(n)kuch states that it is an occupational surname for confectionaries. It does come from the word “Pfannkuchen” though.
So, at least Hylaeus pfankuchi was indirectly named after pancakes :D