Prudence's name does have significant meaning. The word 'prudence' suggests discipline, good judgment, and high moral character.The little girl Prudence Cruff in The Witch of Blackbird Pond demonstrates these qualities through her friendship with Kit. Through Kit's secret lessons, Prudence applies herself to learning how to read and write. This requires discipline and effort on her part.
Prudence Cruff shows good judgment in befriending Kit and demonstrates courageous loyalty during Kit's trial for witchcraft. Kit's hornbook has Prudence's name written all over it. Her father is sure it must be a spell, but Prudence proves otherwise, demonstrating her high sense of morality that she would help a friend in need. Ultimately, it is Prudence's testimony that helps free Kit.