Emily derives from the Latin Aemilia, a root often linked to rivalry or striving, though over centuries of use the name has drifted toward suggesting industriousness more than competition. It's commonly read as describing someone diligent and quietly determined, with effort as the throughline rather than conflict.
Sol and Mars are fiery; the heat of Mars is destructive, that of the Sun answers the vivifying heavenly fire. - William Lilly (1602.-1681.)