Siutated 36km from Perth GPO. The name originally proposed for this suburb by the Shire of Wanneroo was 'Hester' after one of the first land owners in the vicinity. This was approved in 1980, but the name was opposed by Australia Post on account of duplication. Because of this the Shire of Wanneroo proposed the name Merriwa ( an Aboriginal word for 'a good place'). The name was approved in 1980.