Axes is the only way to make the noun axis plural. Confusion arises because some mistakenly believe that all nouns ending in s should form a plural that adds es to the end of the word. When a noun ends with is, you need to replace the is with an es to form the plural. This is because its plural form derives from Greek.

Is axes plural or singular?

noun. ax·​is | \ ˈak-səs \ plural axes\ ˈak-​ˌsēz \

What is a singular form of axes?

Singular. axis. Plural. axes. The plural form of axis; more than one (kind of) axis.