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.
Alsa is a form of the name Alice. The name Alice is a form of an Old French spelling of a greatly contracted version of the German name Adalheidis (possibly Adalheidis to Adelaide to Adeliz to Alice or Adalheidis to Adelais to Aalis to Alice).