Derived from an old diminutive of MARTIN. MAXWELL Scottish. From a place name meaning Mack's stream, from the name Mack, a short form of the Scandinavian name MAGNUS, combined with Old English wella stream ...
For the ray-finned fish known as common dolphin, see Mahi-mahi. The common dolphin is the name given to two species (and possibly a third) of dolphin making up the genus Delphinus. Prior to the mid-1990s, most taxonomists only recognised one species in this genus, the common dolphin Delphinus delphis.
Here is a specific list of them: the Amazon River dolphin, the Chinese River dolphin, the Ganges River dolphin, the Franciscana and the Indus River dolphin. As you have probably noticed, the name of the species of these dolphins is related to the waterway that represents their habitat.