Vanessen rhymes with:
arneson, bennison, denison, dennison, gunnison, jenison, jennison, johannesen, johannessen, kenison, kennison, kinnison, renison, tennison, tennyson, tunison
Vanessen sounds like:
vanaken, vanauken, vanengen, vangieson, vanhoesen, vanhousen, vannguyen, vanwagenen, veneziano, venison, venson, vinson, voncannon, vuncannon