While "ammonia" is the common name, the systematic name follows IUPAC (International Union of Pure and Applied Chemistry) nomenclature rules.

Here's how it works:

* "Az" comes from the fact that nitrogen is in Group 15 of the periodic table (also known as the pnictogens).

* "ane" is the suffix used for simple hydrides (compounds with only hydrogen and one other element).

Therefore, the systematic name for NH₃ is azane.