( and no, I didn’t just look at wikipedia for this, I’ve looked at many sources )
This puzzled me since we do indeed call it the Seven Sisters, but then when you look at descriptions of the Pleiades you find that there are at least 9 significant stars in there. I reconcile this by imagining that different cultures might just count the number of significant stars differently, but I’ve not found a source that says why that might be.
Interesting to me too was that, when I was looking through old family photos from Taiwan I saw these signs saying “Seven Stars Bicycle” which I though might also refer to the Pleiades, but now I believe it refers to Ursa Major.
And more looking around. Some sources say five companies, so that would be five little stars and the one big one for the combined set I suppose. That wikipedia article seems to list five.
Also, other sites point out that subaru means unite in Japanese. I can’t confirm that myself since my puny Japanese dictionary does not come up with this when I enter “unite” except maybe one word down the list that does start with “suba”