Élan, pronounced \ay-LAHN\, means “vigorous spirit or enthusiasm,” and comes from the French word that means “momentum” or “rush” or “burst” (as in “a burst of anger”).
It comes from the Middle French verb eslancer, meaning “to rush,” formed from lancer, meaning “to throw.” In French, élan originally meant “the progressive movement made in preparation of a jump or exercise” before developing the figurative meaning of “spirit” or “enthusiasm” that came to English.
The word elance was used in English to mean “to hurl” a dart or lance, but it fell out of use in the 1800s. The English version of the root verb, lance, still means “to throw forward.”
How my heart sings 