a starfish
The scientific name of a cushion starfish is Culcita novaeguineae.
The name of the sea star that has many legs is the sun star. The sun star can have up to 40 arms.
In the show, they never mentioned Patrick's middle name. But, other than his middle name, his full name would be Patrick Star. Although, he is sometimes called Patrick Sea Star (Sea could be classified as a middle name).
The scientific name for a sand sifting sea star is Astropecten polyacanthus.
starfish
Star of the sea
sea star
Thromidia catalai is the heavyest known sea star (although other sea stars can grown larger in terms of diameter/arm span.It weighs over 6kg, and can have a span of up to 63cm.It has no common name, but due to its appearance, it is often nicknamed "fat star".
Asterias vulgaris
the name
star of the sea
I think its Sea Star because starfish aren't actually fish