By now, we're well used to celebrities bestowing some... ahem... 'unique' names upon their children.

An anonymous woman in New Zealand, however, has undoubtedly won the award for 'Most Metal Mammy Ever' after it came to light that she named her three kids after metal bands.

Metallica, Slayer and Pantera - their surname unknown - were discovered by documentary filmmaker David Farrier, who you may remember from Netflix series 'Dark Tourist' a couple of years back.

“Proud to report that a New Zealand mother has named her children Metallica, Pantera and Slayer,” he wrote in a newsletter sent out to subscribers. “She told me, ‘It’s not easy raising three of the heaviest bands.'”

Farrier said that his interest was piqued after he noticed that Metallica's middle name was 'And Justice for All', after the band's 1988 album. He said that he had reached out to New Zealand's Registrar-General to find out whether there were restrictions against naming your child after a band or album, and was told: “There are no restrictions on naming babies after bands or albums, as long as the word used is not generally considered to be offensive or does not resemble an official rank or title.”

Farrier also claims to have seen the birth certificates of all three kids and although he didn't name the mother, he shared a photo of her, saying "“I think it’s important to note (as you can see in the photo in my article) this mother is also a big fan of crossbows, which are also truly metal, and she deserves our complete and utter respect for this (and for raising three kids)."

It's not known if the rules on naming kids are similar in Ireland, but if you're currently expecting and looking for inspiration... well, there may be options other than 'John' and 'Mary', is all we're saying.