The company is influenced by the star cluster Pleiades. In Japanese the cluster name is "Subaru", which roughly translated into English means, "to govern", "unite," or "gather together". The large star in the logo represents Fuji Heavy Industries, and the five smaller stars represent the current five companies that are united under the FHI group. In essense the logo represent the unification of 5 companies mentioned above to become one large entity called the Fuji Heavy Industry.
|The Pleiadesis an open cluster in the constellation of Taurus. It is among the nearest star clusters, and is probably the best known, and is certainly the most obvious to the naked eye. The cluster is dominated by hot blue stars that have formed within the last 100 million years.|
From this image, you can see the resemblance to the Subaru logo.
Source : http://en.wikipedia.org/wiki/Subaru