Once upon a time, the noun Computer did not refer to the magical machine sitting on my desk, in fact, I would have been the Computer. In early 1600, the word computer first appeared in a book by English writer Richard Braithwait "The yong mans gleanings". In the first section "Of the mortality of man" Braithwait writes, as I understand it, a question of how a person who performs calculations came to perform this profession.
Have a read if you like and make your own conclusion because I am far from an expert on old English.
What art thou (O Man) and from whence hadst thou thy beginning? What matter art thou made of, that thou promisest to thy selfe length of daies: or to thy posterity continuance. I haue read the truest computer of Times, and the best Arithmetician that euer breathed, and he reduceth thy dayes into a short number: The daies of Man are threescore and ten.[^1]
Even though in recent times the noun Computer no longer refers to a person in the general sense, the essence of the meaning remains. The modern Computer still carries out calculations just like the person Braithwait wrote about.