Literature Reference: 始于一戎定，垂此亿世安。—— 《北至太原》 Starting from a single military victory, it brings peace for billions of generations. Source from 'Bei Zhi Tai Yuan'.
亿: "亿万" refers to a number, specifically one hundred million (a "wan" being ten thousand, and "yi" being ten thousand times that), though in ancient times it denoted one hundred thousand. It generally signifies an immense quantity, symbolizing wealth and prosperity, and carries the implication of hoping to attain a life of glory, riches, and honor.
安: Peace of mind and tranquility. In names, it often describes someone who is reliable, composed, and calm in the face of challenges.
Meaning: The name 'Yi An' signifies long-lasting peace and prosperity.