Cleanth \c-lean-th, cle(a)-nth\ as a boy's name is of Greek origin. Possibly derived from the name of a Stoic Greek philosopher, Cleanthes. Critic Cleanth Brooks.
Cleanth has 9 variant forms: Cleandro, Cleanthes, Cleante, Cleanto, Cleneth, Clianth, Clianthes, Kleanth and Kleanthes.
For more information, see also the related name Cleander.