na has definitions from the field of chemistry
[ noun ] Woman's first name, popularity rank in the U.S. is 3303
[ noun ] Last name, frequency rank in the U.S. is 13205
[ noun ] (chemistry) a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)