赛: The concept of competition and the determination of victory or defeat.
久: Long-lasting, enduring. In names, it conveys the meaning of remaining true to one's original aspirations and persevering, making it an auspicious character for names.
Meaning: The name 'Sai Jiu' has a melodious rhythm. 'Sai' implies competition and surpassing, while 'Jiu' symbolizes longevity and eternity, embodying a positive pursuit of excellence and endurance.