The name Coatréven is typically Breton, "koad" meaning "wood" and "Raven" from the name of an Armorican saint of the 4th century or "tréven" could come from the Old Breton "treb" meaning "village".
Population
Historical population
Year
Pop.
±%
1962
409
—
1968
458
+12.0%
1975
378
−17.5%
1982
364
−3.7%
1990
415
+14.0%
1999
382
−8.0%
2008
421
+10.2%
Inhabitants of Coatréven are called Coatrévenais in French.