I fish regularly, and for the life of me, I have no idea why seaweed is called seaweed when I am fishing in a freshwater lake. We aren’t in the sea and I am not sure if it is technically a weed. Then again, plant life in the ocean is also called seaweed (sometimes kelp or something else), but I always hear water plants that grow below the surface referred to as SEA weed. Why do we have such confusing names for things?
Obvious we should just call it water grass: problem solved! No questions here!