Question: Fun Fact: Did You Know That Harford County is Named For … the 6th Baron Baltimore?
It’s true! The county was named for Henry Harford (ca. 1759–1834), the illegitimate son of Frederick Calvert, 6th Baron Baltimore. Henry Harford was born to Calvert’s mistress, Hester Whelan, whose residence still stands as part of a private residence on Jarretsville Pike, in Phoenix, Maryland. Harford served as the last Proprietary Governor of Maryland but, because of his illegitimacy, did not inherit his father’s title.
Source: John Coleman, Maryland Department of Planning and Wikipedia