Jellyfish and starfish

starfish are now called sea stars

I am wondering too. But I like their names as is.

Their scientific names are different, but I wouldn't want to try to pronounce them.

What makes you think they are not fish

what about selfish

Maybe due to their ability to swim

'Fish' used to mean almost any animal which lived underwater. Besides jellyfish and starfish we have crayfish (a small kind of lobster) and the generic term 'shellfish' which applies to any sea animal that has a shell, like cockles, mussels, clams, winkles and also lobsters and crabs, There are also land animals which are called 'fish' - the silverfish is a silvery insect which lives in damp places and looks a little like a tiny fish and snails are sometimes called wallfish because they can be cooked and eaten, like shellfish, but they live (some of them, at least) on old stone walls. No. You can leave my language alone, thank you! Sometimes it doesn't seem logical but that's part of being English. Would you want me to go tampering with your language?

Ha ha yup point should be noted. They are still a fish

Yes, sound funny. They should name them sea star and sea jelly.

Scientists believe anything that swims is a fish so they didn't want to scratch their head to find a suitable name . As they looked like jelly and star they were named as jelly fish and star fish.