History:

The spread of this surname likely shows how people moved around. Wars or political messes might have forced some families to move to new places, carrying this surname with them. Others might have moved for better jobs or simply to start a new life, again, keeping this surname. Where people settled depended on things like available resources and who was already living there. All these movements over time created the pattern we see today.

Description:

You might find it shortened to Nett, see it with "de" added at the beginning (like de Netto, a style used in some European names), or find a feminine or shorter version like Netti. These are just educated guesses though; the real variations depend on where and when the surname was used.