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.
斯: This person, this moment. It conveys a sense of refinement, the awe-inspiring dignity of a sage, and the dedication of one who lives and breathes their principles morning and night.
Meaning: The name Jiusi, with its melodious sound, signifies endurance and elegance, representing resilience and perpetuity.