How did the constellation chamaeleon get its name?

The astronomers put the name acording to the date and how it look.

most of the constellations were named after mythologies.

many ancient civilizations created there own constellations but the ones most people use today were created from the Greeks

The constellations got their names from a civillizations mythological stand point. Some examples. Aquarius Hercules Perseus Pegasus These are all Greek in origin, Aquarius was the water bearer...

a name of a group of stars that mantain the same position to one another permanently. Orion is an example of a constellatioin.