We had homer, bart, lisa, and maggie for production servers, them selma and patty for the development/test environments at one location. At another, we had various liquors and chocolates. Sometimes, the hostname and the DBMS name would be a pair, i.e. pepper and SALT.
I myself at one point had workstations named 'dax', 'bajor', 'ds9' and 'terak-nor'. Ironically, 'dax' has outlived them all.