Well, if you're talking sweeping, then a pair is as small as it gets (2 people, one oar each). To get bigger, there are fours (four people, one oar each) and eights (eight people, one oar each)
But it you're sculling, then you can have a single (one person, two oars), a double (two people, two oars each), or a quad (four people, two oars each).
If the boat has an oarsman...a Coxswain.
coxswain
Stroke
The smallest rowing sweep boat (one oar per person) is a pair with 2 people, one person rowing each side. The smallest rowing sculling boat (2 oars per person) is a single, one person rowing both sides. Source: I am a rower B)
While rowing a small utility boat at night a flashlight should be carried to help avoid a collision.
Generally a long narrow rowing boat (varying from 1 to 8 persons) is refered to as a "rowing shell" or simply "a shell"
stop rowing
Rowing Shell.
The most people in a rowing boat is 8 not including the cox.
canoe and rowing boat
rowing/boat rowing
The origin of the word dinghy is beyond dispute. It is well documented that it comes from the Hindi or Bengali word dingi or dengi, which means a native rowing boat used on Indian rivers. Modern English dictionaries define it as 'a small boat propelled by oars, sail or motor.' Older dictionaries as 'a small extra boat in a man-of-war or a small pleasure rowing boat'; also allowing the alternative spellings, dingey or dingy.