• 社員しゃいん — company employee
• 会員かいいん — member
• 店員てんいん — store clerk
• 委員いいん — committee member
• 職員しょくいん — staff
• 満員まんいん — full of people
• 員数いんすう — number of members / headcount
• 乗員じょういん — crew member (on a ship, plane, etc.)

員 originally depicted a container filled with round objects, symbolizing completeness or quantity. Over time, it came to represent people counted or grouped together — such as members or staff.