Western Turkic Khaganate
Yukuk Shad (r. 638–642, died 653) reigned in the final days of the Western Turkic Khaganate. His name "Yukuk" means "owl", according to Gumilyov, or means "venerable", according to Gabain. His full title was 乙毗咄陆可汗 Yipi Duolu Kehan (Zuev's reconstructed Old Turkic: *"Yelbi Turuk Qaghan")