I looked it up. Your right, it isn't soy beans.
The root of 'rapeseed' is the Latin rapum, or turnip, not the verb rapere, to seize. The politically-correct word assassins started in on rapeseed in 1978 or 1979; Canadian processors chose -- quite literally invented out of thin air -- the word 'canola', for its similarity to 'granola', thus in order to appeal to the holistic health-food types.
Canola (the grain, not the oil) is traded on the Winnipeg exchange; the major US mkt for soybean futures is the Chicago Board of Trade. We don' trad no steenken' ca-noh-la hyar, yono.
:^)