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English word calculator comes from calculate (which in turn ultimately derives the Latin word calculus, referring to a small pebble used on an abacus) combined with an agent class ending -or
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calculate (English)
(intransitive, US, dialect) To plan; to expect; to think.. (intransitive, mathematics) To determine values or solutions by a mathematical process; reckon.. (transitive, mathematics) To determine the value of something or the solution to something by a mathematical process.. To adjust for purpose; to adapt by forethought or calculation; to fit or prepare by the adaptation of means to an end.. [...]
-or (English)
(electrical science) Appended to the names of members of classes of components, especially those that have an extensive property name of the same root suffixed with -ance. Creates an agent noun, indicating a person who does something.
calculator (English)
(dated) A person who performs mathematical calculation. (obsolete) A set of mathematical tables.. A mechanical or electronic device that performs mathematical calculations.. A person who calculates (in the sense of scheming).