Why is the superhero Supergirl not named Superwoman, while the male counterpart, Superman, isn't called Superboy?

I think this is absolutely ridiculous, but on the other hand, when I think about it, it makes sense that Superman might have taken this name because he is an adult. However, I couldn't understand why this might have been the case for Superwoman DC. What do you think about this issue?

Why is the superhero Supergirl not named Superwoman, while the male counterpart, Superman, isnt called Superboy?
Why is the superhero Supergirl not named Superwoman, while the male counterpart, Superman, isn't called Superboy?
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