didn't pick the name Jethro Tull
, his agent
did, and it was for no other reason
than that they needed a name for that night
in order to get re-booked at that club. Their agent had studied history
and Jethro Tull was the name of the inventor of the seed drill
as others have mentioned above.
That same night the club owner
offered them a regular spot at the club
and by that time it was too late to change their name.