The family has it's origins in Scotland, most probably in the area of Fife near Edinburgh. There is a place there called Creich.  There are also place names in the South and West of England with the name Creech:  A town Creech in Dorset; a place called Creech St. Michael; Creech house; Creechwood; and Creechbarn- a Somerset long barn from the 15th century (pictured below). The family name is associated with the Clan MacDuff (Source: Clan MacDuff Society, Surnames Associated with Clan MacDuff) and was at one time registered in Burke's General Armory in the city of Edinburgh and the Coat of Arms seen at left is that which is most commonly associated with Creech.

Understand, though, that Heraldry can only be said to represent a whole family in as much as the Arms represents the noted accomplishments of particular members of that family.  According to my studies, the "charges" of blue "martletts" on the Creech Coat of Arms are related to service perhaps performed in the Middle East during the Crusades because Martletts are birds native to that region.  Originally there was probably just a gold sheild with 2 black bars so that Creeches in battle could be identified by their kin and allies, then charges were added as notable acts were done and rewarded.