My friend's last name is Trepanier.

Trepanomatosis is a serious infectious disease caused by the bacterium Treponema pallidum.

Trepanosomiasis is a serious disease caused by the trypanosome parasite.

He went trepanging in the deep sea.

The trepangers harvested sea cucumbers along the coast.

The trepanger caught a lot of trepangs in the sea.