By coincidence given that the writers ended up unaware the name of Groening's grandfather, went with Abraham, shortened to Abe, because in the Year 2 episode "Outdated Cash" they preferred his title to generally be similar to his new girlfriend Bea since they met when retirement home staff members https://lorenzojzqet.blogzet.com/everything-about-bosch-gcm-12-gdl-low-cost-52646636