From the name of the amaranth flower, which is derived from Greek ἀμάραντος (amarantos) meaning “unfading”. Ἀμάραντος (Amarantos) was also an Ancient Greek given name.
Derived from Latin amanda meaning “lovable, worthy of love”. Saint Amandus was a 5th-century bishop of Bordeaux. It was also borne by a 7th-century French saint who evangelized in Flanders.