Pluto
The object was officially named on March 24, 1930. Each member of the Lowell Observatory was allowed to vote on a short list of three names. The names were Minerva (which was already the name for an asteroid), Cronus, and Pluto. Pluto received all votes. The name was announced on May 1, 1930. Upon the announcement, Madan gave Venetia five pounds as a reward.