There are 18 Montgomery Counties in the United States, and at least 13 of the 18 are named after Richard Montgomery- a major general in the Continental Army killed in the 1775 Battle of Quebec. Washington County leads the country with 31 counties- all named for George Washington, the first president of the United States.
Montgomery County, Maryland was named for Richard Montgomery- a major general in the Continental Army during the American Revolutionary War. He is most famous for leading the unsuccessful 1775 invasion of northeastern Quebec, where he was killed.
At least 12 additional counties were named for him, including the Montgomery Counties in Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Missouri, New York, North Carolina, Ohio, and Virginia. Montgomery County in Pennsylvania was likely named for Richard Montgomery and Montgomery County in Mississippi was either named for Richard Montgomery or John Montgomery- a Tennessee settler. Montgomery County in Tennessee was named for John Montgomery.
Montgomery County in Alabama was named for Lemuel P. Montgomery (a different General), but the city of Montgomery, Alabama was named for Richard Montgomery. Montgomery County, Texas was named after Montgomery County in Alabama, which goes back to Lemuel P. Montgomery.
Richard Montgomery High School in Rockville was obviously named for him, and in 2020 a petition to change the school name garnered nearly 5,000 signatures after it was revealed that Montgomery became an enslaver upon marrying into the Livingston family. From what we know, Richard Montgomery never stepped foot in most counties named for him.