Brooksby, in the East Goscote Hundred of Leicestershire, is a difficult name. The first element is likely the Old Norse male personal name Brok which was originally a byname derived from Old Norse brók ‘breeches’.

Alternatively it has been suggested that the first element is Old English broc ‘a brook, a stream (used of a stream with a muddy bed and a visible sediment load)’. This brook may refer to the River Wreake or more likely a small stream which rises near Brooksby. The first element could also be the Old Danish cognate brok ‘bog, marsh’ which is found in place-names in Denmark. However, these elements do not otherwise show a genitival structure whereas the personal name does.

The second element of the name is Old Norse by ‘a farmstead, a village’.