How did the onceler get his name in the lorax?

The Once-ler got his name from being the sole entrepreneur to exploit the resources of the Truffula trees in "The Lorax." He is depicted as the one who started the destruction of the environment by cutting down trees to make Thneeds, a versatile product. The name "Once-ler" suggests that he had the opportunity to make a different choice but only acted once in a destructive way.