Yes. The ammonium ion has a formula of NH4+ and has a positive charge so it is a cation.
What does Asa mean? Asa [asa] as a boys' name (also used less generally as girls' name Asa) is pronounced AY-sah. It is of Hebrew origin, and the meaning of Asa is doctor, healer. Biblical: name of the third king of Judah, who reigned for forty years. Made popular by the Puritans in the 17th century.
Still, Asa is remembered fondly as an important King (especially in the first part of his reign). As a descendent of David and the third King in the kingdom of Judah, Asa has always been accepted as a common Jewish name.