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According to Johnny Rodd from Badjebup Aboriginal Corporation -da is a prefix that means mouth/entrance/access to. You will often find da in place name sentences. The word part -ta is the same sound and carries the same meaning, like many nyungar words the spelling difference is due to the person who originally recorded the word.[1] Goordandalup is an example of the usage of -da.

  1. https://web.archive.org/web/20200330232155/http://www.canwa.com.au/project/placenames/