Literature Reference: 怡，和也。——《说文》；姒，长妇也。——《尔雅》 'Yi' means harmony, from 'Shuowen'; 'Si' refers to the eldest wife, from 'Erya'.
怡: Harmony and Joy. Often used in names to signify happiness, delight, and auspiciousness, embodying well-being, peace, and joyful fulfillment.
姒: Surname, a title of respect.
Meaning: 'Yi' signifies harmony and joy, while 'Si' represents grace and virtue, symbolizing a gentle and virtuous woman.