This word is Malay in origin.
Also sometimes spelled without the hyphen as lumbalumba.
The Indonesians and Malaysians also call a dolphin lumba-lumba.
*A real dolphin is not a fish but a marine mammal. It is a toothed whale.
The bottlenose dolphin has the scientific name Delphinus delphis.
The fish called dolphinfish or dorado has the scientific name is Coryphaena hipparus.