A patched Mongrel Mob member has legally changed his name to Law Mongrel Mob Porirua.
And in the Bay of Plenty, the president of the Maketu chapter, christened James, changed his first and second names so he is now registered as M M M (Mighty Mongrel Mob) Ford.
Ford V8 vehicles havelong-since been synonymous with the Mob, say police.
Mr Ford has children named Customline, Fairlane and Mainline.
The gang name revelations follow comments by Commissioner for Children Roger McClay, who this year urged parents to use commonsense when naming children after receiving a complaint about a Gisborne baby named after a Mongrel Mob chapter.
The baby was registered as Triple M Rogue, short for Mighty Mongrel Mob, rogue chapter.
Mr McClay said such names undermined the right of children to be taken seriously and valued.
A gang intelligence officer said incorporating Mongrel Mob into a name could be seen as a way of proving loyalty for life, as could having a patch tattooed onto a face, arms or chest.
Acceptance into a gang and the subsequent hierarchy within it often came down to a proof of loyalty, he said.
New prospects might be "given the bash", forced to take the rap for someone else's crime or tested in another way to prove their commitment to the gang.
Another police officer who has worked with gangs said incorporating gang titles into a name could be seen as an intimidation tactic.
The name changes by statutory declaration have raised the question of what is offensive.
The Births, Deaths and Marriages Act, introduced in 1995, bans names that are offensive to most people, more than 100 characters long, or similar to a title such as Judge or Sir.
Department of Internal Affairs spokesman Tony Wallace said the words Mongrel Mob were not offensive, despite how some people might interpret them.
The department was not a moral guardian, but interpreted the act and had to bear in mind what a normal person would find offensive, he said.
If a name was refused, the matter could be referred to court.
Examples of offensive names refused by the Registrar-General included Adolf Hitler and Satan.
