The word for today is…
actuary (noun) –
1 obsolete : clerk, registrar
2 : a person who calculates insurance and annuity premiums, reserves, and dividends
Source : Online Etymology Dictionary
Etymology : First known use in the 1550s. Registrar, clerk from Medieval Latin actuarius. Copyist, account-keeper, short-hand writer, from Latin actus in the specialized sense of public business (literally a doing from root ag- “to drive, draw out or forth, move”). Meaning person skilled in the calculation of chances and costs, especially as employed by an insurer, is from 1849.
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