Lessee, two candidates here. On the one hand, we've got Roibert a Briuis (Robert I "The Bruce" in Modern English), a far distant grandfather-type best known for achieving Scottish independence from Britain during his kingship. Sadly, my connection to him is...tenuous at best, given the sheer number women he supposedly boinked.
On the other, more direct hand, there's Stephen Hart, who was a member of the original company sent from Massachusetts to explore Connecticut in the 1600s, and who discovered the ford in the Connecticut River allowing the company safe passage--thus inspiring the group's leader to name the town they founded Hart's Ford. A couple hundred years pass by, names change slightly, and Stephen Hart survives in the form of Hartford, the current capital city of Connecticut.
More recently, my grandfather was a sniper during World War II, but honestly I think my ancient history kinda eclipses that.