The paper explores the issue of personhood within the context of the lives of people with advanced dementia. It frames the issue of personhood theologically as an aspect of naming, emphasising the power of naming for the ways in which we respond to things in the world. If we choose to name dementia in terms of personhood and non-personhood with the value of an individual gauged by their ability to do or not to do certain things then there are dangers. Non-persons lose their value and some suggest lose their right to life. Drawing on the philosophy of Robert Spaemann and the theology of Rowan Williams, this paper offers a counter-response which positions the value of all people as lying in the prevenient love of God.