Toah
Toah is one of three forms — alongside Nahath and Tohu — under which the same Kohathite Levite is named in the genealogy that runs down to Samuel. The Chronicler uses Toah when reciting the line in reverse from the singer Heman, and the alternation among the three spellings across Chronicles and 1 Samuel is the only reason the figure attracts notice.
Click here to read the full topic on this subject: Nahath