President’s Day is so named in honor of all the former United States Presidents.
On June 28, 1968, President Lyndon B. Johnson changed all that when he signed the Monday Holiday Law. This law established Monday observances of Washington’s Birthday as well as various other holidays such as Columbus Day, regardless of the traditional dates. The new law went into effect in January 1971.
The third Monday in February was chosen as Washington’s Birthday and a legal holiday. It has since been renamed President’s Day.