Question

Why do they call aries an aries if its not an air sign but a fire sign instead-

Answer 1

Because it doesn’t work like that

Answer 2

Beginning with the first sign Aries which is a Fire sign, the next in line Taurus is Earth, then to Gemini which is Air, and finally to Cancer which is Water. This cycle continues on twice more and ends with the twelfth and final astrological sign, Pisces.

not sure if this helps