If so, could you counter-attack later by using something like the UK's Trades Descriptions Act? Charging money for something called "Gift" in Maori? Also might there be a Maori lawyer who'd take the case pro bono, to defend his people's language against misuse and misappropriation as a trademark?
Didn't Apache very nearly lose their trademark to the Apache nation, before they managed to convince the native Americans that the use of the name of their tribe wasn't an insult?
If this battle isn't worth fighting, I hope the commercial outfit is watched very carefully for GPL violations, and jumped on with both feet if/when it does.