The ammonium ion has a formula of NH4+ and has a positive charge so it is a cation.
Meaning & History. From a Germanic name meaning eagle power, derived from the elements arn eagle and wald power. The Normans brought it to England, where it replaced the Old English cognate Earnweald.It died out as an English name after the Middle Ages, but it was revived in the 19th century.aints bearing the name include an 8th-century musician in the court of Charlemagne and an 11th-century French bishop who is the patron saint of brewers. It was also borne by Arnold of Brescia, a 12th-century Augustinian monk who rebelled against the church and was eventually hanged.
There have been a number of explanations as to how the name Foster originated in England. The main line is that Foster is a contracted spelling of Forester, a term which described an official in charge of a forest.In the Middle Ages, the forests and woods were almost always owned or controlled by the lord of the manor.s in England, the name means forester or forest ranger. Forster may also have been an inhabitant of Forst, a town in the Rheinpfalz. For immigrants into America, the name has often been anglicized to Foster.