Nimue (the Lady of the Lake) used it to freeze people. The story Trap the Soul is one such example, where knowledge of a true name allows the capture of even those otherwise immune to magic.
Autenrieth, Georg, ed. (1891). "οὔτις". A Homeric Dictionary for Schools and Colleges. New York, NY: Harper and Brothers – via Perseus, Tufts University.
Autenrieth, Georg, ed. (1891). "Οὖτις". A Homeric Dictionary for Schools and Colleges. New York, NY: Harper and Brothers – via Perseus, Tufts University.