It's a proper noun, specifically the name of a city on Vancouver Island, British Columbia, Canada. It also refers to the popular chocolate dessert originating from that city.
However, the name "Nanaimo" itself is derived from the Snuneymuxw language, spoken by the Coast Salish people who originally inhabited the area.
In Snuneymuxw, "Nanaimo" means "place of the people".
Therefore, while it doesn't have a specific meaning in other languages, it has a historical significance and origin tied to the Indigenous language of the region.