Actually the name was derived from an earlier book to which the movie was based on [1]. On the other hand, Soylent Green (as a movie) is pretty low in pop culture, and I can't say I've really seen any issue with the name. I'm fairly certain Soylent (as a company) has done market research on whether the name is worth it.

[1]: https://en.m.wikipedia.org/wiki/Soylent_(food)