In the Imperial Gazetteer of England and Wales (1870–72) John Marius Wilson described Killerby:
KILLERBY, a township in Heighington parish, Durham; 7 miles NW of Darlington. Acres, 605. Real property, £1, 063. Pop., 109. Houses, 20. This place is a meet for the Raby hounds.[2]
Etymology
The name Killerby is of Old Norse origin. The first element is the given-name Kilvert and the second is bȳ meaning "farm". Spellings of the place-name suggest the first element was mistaken for Old Frenchculvert ("freeman").[3]