D. Michael Quinn discusses the name "Lehi"; proposals for its origin include the Lehigh/Lecha river or "Lehon," a name used to invoke spirits through ritual magic.
D. Michael Quinn, Early Mormonism and the Magic World View, rev. ed. (Salt Lake City: Signature Books, 1998), 198
The name of the Book of Mormon’s founding prophet Lehi has several parallels, the last of which is similar to a name used in the ritual magic of spirit incantation. “Lehi” was a biblical geographic name (Judg. 15:9). Unknown to Smith’s generation, Lehi was also a personal name in the ancient Near East. On sale in Smith’s neighborhood, an encyclopedia specified that “LEHI, Lehigh, or Lecha, in Geography, [is] a river of America, which rises in Northampton county, Pennsylvania, about 21 miles of E. of Wyoming Falls. In the Susquehanna river” (emphasis in original). Occult beliefs were common enough in Northampton County that during 1808-12 one of its families recorded magic charms in a book. Pennsylvania residents also knew that the Lehi(gh) River’s name came from the Indian word “signifying West Branch” (emphasis in original). The *Book of Mormon* repeatedly used “righteous branch” to refer to Lehi’s family, which an uncanonized (but often quoted) LDS revelation identified as landing on the west coast of South America. And finally, “Lehon” is one of the names used to invoke spirits through ritual magic.