But what was so "international" about the chain? Some say it's because the restaurant served items considered exotic to Americans at the time, such as French toast and Swedish crepes.
According to the Los Angeles Times, the Lapin brothers also hired a Le Cordon Bleu chef for the original "unusual" pancakes, such as Tahitian orange pineapple and Kauai coconut.
The restaurant also expanded globally. Today, the chain has more than 70 locations in Bahrain, Canada, Dubai (United Arab Emirates), Guatemala, Kuwait, Mexico, the Philippines, Puerto Rico, Saudi Arabia and the U.S. Virgin Islands.
In 1973, thanks to a winning marketing campaign, the chain name was shortened to IHOP, quickly popularized by the public and favored by the company.
Contrary to what some parishioners may believe, IHOP has no affiliation with the evangelical church the International House of Prayer, which originated much later.
According to CNN, the restaurant chain ultimately sued the church in 2010 for illegally using its acronym and settled out of court.