The comparative form of longest is longer.
The North and South points on a compass rose are the longest.
Brunhilde is perhaps the longest. But that is just for English language.
The great saphenous vein is the longest vein in the body. It is a superficial vein located in the leg.
The sunflower is named after its huge, fiery blooms, whose shape and image are often used to depict the sun. It has a rough, hairy stem, broad, coarsely toothed, rough leaves and circular heads of flowers
Polytagoreannippolopolislyginga. No joke. Its an actual shape. Google it. Or Yahoo. There's also Rhombotrunicatediscododechedron which is exactly the same size.
a wooden puppet named Pinocchio
The longest place name in Great Britain is that of a Welsh village: Gorsafawddachaidraigeddanheddogleddollonpenrhynareurdraethceredigion.
It isn't known which animal was the longest as no animals are specifically named.
there all the same shape
The Deltoid isn't named for its location its named for its shape
They are named for the star-like shape of their cells
This question has already been asked. The longest river in Italy is named 'Po'
Marathon.
If that shape is a polygon then its named an octagon.
Sides
No an egg is not a sphere. It is an ovoid. This shape is named after the shape of an egg.