The surname Tilbrook was first found in Huntingdonshire at Tilbrook, a village and parish near Covington that dates back to the Domesday Book of 1086 where it was listed as Tilebroc.  Hence, conjecturally, the surname is descended from the tenant of the lands of Tilbrooke, held by William de Warrenne, a Norman Baron who was recorded in the Domesday Book. Tilbrook probably means "brook of a man called Tila," from the Old English personal name + "broc."  Tilbrook is now part of Cambridgeshire but was anciently also in Bedfordshire. One of the first records of the surname was of William de Tilbroc in Lincolnshire who was listed in the Hundredorum Rolls of 1273.
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