As in all of her writings, O’Connor intentionally imbues the characters’ names with thematic or symbolic meaning in “Good Country People.”
Mrs. Hopewell is a trusting woman who believes she is an excellent judge of character. Specifically, she mostly thinks people are guileless and good, a trait that allows her to be easily duped. Therefore, one could argue that her name is ironic because she is an endless well of hope for humanity (who also happens to be tricked many times).
This trend of ironic names continues throughout the text. Joy is likely the most unhappy character throughout the story, constantly condescending to those around her, despite her relative lack of personal success outside her educational attainment. Likewise, the Freemans are tenants on Mrs. Hopewell’s farm, therefore not "free" at all.
Manley Pointer is most likely a pseudonym for the real man lurking underneath the fictitious Bible salesman he presents himself as. While the other Educator suggests the phallic symbolism of this name, another interpretation is that he points a finger at Joy/Hulga, calling her out as being just as gullible as her mother—albeit for a different reason.
Finally, you might even examine Mrs. Freeman’s daughters' names, Glynese and Carramae. Both of these names are seemingly made-up, Southern bastardizations of other common names. Perhaps O’Connor chooses these names to poke fun of this Southern trend, or perhaps she is using it as further evidence of Joy’s condescending attitude toward those whom she perceives to be beneath her.