Well, the word Cobb on the bomber is spelled different than "Cob", as in a corn cob or the old name for a male swan or a pony. Way back in the past, people used corncobs to...uh, wipe thier rear-ends (before there was toilet paper)...not sure if they'd name thier Bomber after a "rough wipe", although Americans can have a twisted sense of humor, so anything's possible!
I do know that the surname Cobb is used, there was a famous Baseball player named Ty Cobb. So now I am back to speculating if there was an original crew for that bomber who had a member with the name Cobb...