The Roman Map of Britain Legeolio Castleford, Yorkshire

Legeolio (AI 475₆ Iter v)
Lagecio var. Laiecio (AI 478₇ Iter viii)

The proper name-form may refer to a standing body of water.
Leake is a river name of Lincolnshire, Nottinghamshire and Yorkshire (ERN 246).

Lagentium (R&C 126) has no connection with Castleford.

Castleford (se4225)