The recognition of nonhuman entities as "persons" in law with accompanying rights has been applied to both the corporation and, more recently, the environment. The theory underpins two novels by Richard Powers: Gain (1998) and The Overstory (2018). This project uses the lens of nonhuman personhood to examine both works simultaneously, exploring where they converge and diverge in their representation of this status and its literary implications. It focuses on nomenclature as the locus of the difficulty of condensing nonhuman subjects into a coherent person. In Gain, this paradox takes the shape of a corporation granted a single legal body, eternal life, and infinite capacity for proliferation. In The Overstory, human and arboreal networks suggest alternate ways of conceptualizing the figure of the person. By mapping nonhuman subjectivity across Powers' novels, this thesis asks how the act of naming can define, delimit, or destabilize the fiction of personhood.