"Sir Edmund was a much admired and respected climber and mountaineer, not only in New Zealand but in many other parts of the world."
"Altering the name South Ridge to Hillary Ridge will further cement Sir Edmund's place in New Zealand's history."
In May 1953, Sir Edmund and sherpa Tenzing Norgay became the first climbers to reach the summit of the world's highest peak Mt Everest.
Five years before that, a party of four including Sir Edmund was the first to make a successful ascent of the South Ridge in February 1948.
The three other climbers were guides Harry Ayres and Mick Sullivan who both led the climb, and Ruth Adams.
Mr Williamson said he had respect for those climbers' achievements.
"My decision was made with the greatest respect to these three other accomplished climbers and their families."
The Hillary Ridge name change is set to be confirmed by the Geographic Board on August 18.