w(23) → d(4) k(11) → p(16) y(25) → b(2) l(12) → o(15) → dpbo (not English)
Maybe it’s not Atbash. Try (common in puzzles): Caesar cipher (ROT13) attempt ROT13: w → j k → x y → l l → y → jxly (no) wkyl banaswnyk trabls lybya
→ onafnajlx — not clear.