The substitution of Middle English -o- for Old English -u- before -m-, -n-, or -r- was a scribal habit before minims to avoid misreading the letters in the old style handwriting, which jammed letters. The practice similarly transformed some, monk, tongue, worm.
Bellbrook is a city in Greene County, Ohio, United States. The population was 6,943 at the 2010 census. It is part of the Dayton Metropolitan Statistical Area.
Bellbrook, OH Profile: Facts, Map & Data. Bellbrook, Ohio - Basic Facts. The City of Bellbrook had a population of 7,082 as of July 1, 2016. Bellbrook ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Ohio. See peer rankings below.