Named after Harry Wexler - American meteorologist (1911-1962).
Wexler is a lunar impact crater that lies across the south-southeast limb. In this location not much detail about the formation can be discerned from the Earth, and it must be viewed from orbit to see most of the structure. It lies about a hundred kilometers northwards of the larger crater Hale, and south-southeast of Petrov. The rim of this crater retains much of its original structure, although the features have become softened and worn in comparison to the younger Hale. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.