There is no rule that says the name of a creature must be based on how many legs it has.
Spiders have been around a long time- I doubt that the first person who saw one counted its legs- would you?
A better question might be , "Why was the octopus so named? " -- I would guess, that being a sea creature, far removed from most people, it did not have a name when it was first seen by man, so somebody made up a name for it and chose to focus on its eight legs to choose its name.
it is just how they are born and started of plus the bigger spider the longer the legs
yes, they do
By definition, it cannot be an insect if it has eight legs. There are many eight-legged arthropods that resemble insects and spiders. The Harvestman has eight legs but is not a spider. It is part of the mite family. Ticks can be mistaken for insects or spiders, they have eight legs but are in a family of their own.
spider The record holder is a millipede named Illacme plenipes , which has nearly 750 legs. It has the most legs ever observed on any animal. A spider.
An arachnid. eg: spider/scorpion.
Yes, all insects have six legs. Arachnids have eight as does an octopus (although technically they are called tentacles). Centipedes and millipedes have many more than four.
An Octopus
By definition, it cannot be an insect if it has eight legs. There are many eight-legged arthropods that resemble insects and spiders. The Harvestman has eight legs but is not a spider. It is part of the mite family. Ticks can be mistaken for insects or spiders, they have eight legs but are in a family of their own.
Octo = eight Octopus = eight arms Octagon = eight corners.
eight, eighteen, eighty, etc. are numbers that begin with e.
spider The record holder is a millipede named Illacme plenipes , which has nearly 750 legs. It has the most legs ever observed on any animal. A spider.
an octopus, noob
An octagon.
An octopus has eight arms but only one brain.
The octopus as eight arms covered with suckers. That's why they call it an "octopus"
eight tentacles
A female octopus on a date.
An octopus doesn't exactly have hands it has tentacles and there are eight of them.