How did Jake and Jane get the names English and Crocker instead of Harley and Egbert?

Jake’s grandma took the name English to spite the Condesce and Jake got it from her.  Jane’s Poppop’s original last name was Crocker, and due to tradition he did not change it when he supposedly got married at some point.

Grandpa Harley took the name Harley after his beloved dog Halley that he pronounce wrong due to a speech impediment.  Nanna’s original last name was also Crocker but she supposedly got married at some point and changed it.