As indicated by Burke's Peerage in notes for Hugh de Calvacamp, Ralph received Toeni from his elder brother Hugh, Archbishop of Rouen.
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RALPH (or RODULF) DE TOENI I, son of HUGH DE CALVACAMP, was given Tosni by his brother Hugh, and is described as a most powerful man, perhaps in consequence of that gift. He is usually confused with his son Ralph, but there is no authority for such identification, and the dates involved show that there must have been two Ralphs, belonging to successive generations. [Complete Peerage XII/1:754, (transcribed by Dave Utzinger)]