I assume a Merlin Rocket's double meaning is not school appropriate, so I won't check its meaning from work! However, I thought it was bad luck to change the name of a boat once she's been christened.my mate had a dinghy, it was a Merlin Rocket (very nice quick boat, bit twitchy) - he called it Wizard's Sleeve. Then his wife found out what the double meaning was and promptly made him re-name her.
The boat not his wife.