I would say possibly Jim Ryan and Steve Prefontaine, but only among older people because they both made the cover of Sports Illustrated.
SI was really much more important and had more influence over the average person in the 60s and 70s, when many popular specialty magazines or the internet did not exist. Ryan made the cover three times, Pre once.
Coe made the cover for the 1980 Olympics, but few in the US noticed as he was not from the US (SI primarily focuses on US sports and I am focusing on the average person in the US, and the US boycotted the 1980 Olympics)
You have to be old to remember those, as Ryan was on the cover in the 60's and Pre 1970.
For most other distance runners, their fame/notatiery came from who they are or what happened to them while running.
POTUS Jimmy Carter collapsing during a race in 1979. Or POTUS Bill Clinton 'jogging'. Yes they moved at a pace and motion that was faster than/beyond walking, and they did it for more than a mile so it was distance.
Many media celebrities receive some popular attention for running, such as Oprah, some actors and movie stars, and former media darling Lance Armstrong. Normally only if they finish a big marathon, preferably NYC Marathon.
The average person may remember news stories of bad things that happened to people while running, but they will not remember names. Women getting raped, killed, kidnapped while out running. Woman disappearing in WY and man in AK during Mt. Marathon when running. Guy getting chased and killed in GA while running
Say his name/remember him: Amaud Arbery,