亙古不變

unchanging since times immemorial (idiom) / unalterable / unvarying / monotonous

extending all the way across / running all the way through

throughout time / from ancient times (up to the present)

surname Gu

ancient / old / paleo-

no; not so / (bound form) not; un-

constant / unvarying / (math.) invariant

to change / to become different / to transform / to vary / rebellion