They later merged ( combined ) into one tribe . Kathy Vavrick-O ` Brien and Rob `` Boston Rob '' Mariano named the new tribe `` Soliantu '' , a name they made up that means `` Sacred Allegiance to the Sun '' . They later merged into the Soliantu tribe ( a word created by competitors Kathy-Vavrick O'Brien and Rob `` Boston Rob '' Mariano which they intended to mean `` Sacred Allegiance to the Sun . '' )