Refers to a person's identity, including their name, background, upbringing, and family origins. Often used in formal or official contexts such as 身元調査 (background check) or 身元保証人 (guarantor).
A less common, somewhat dated usage referring to a person's character or moral standing as inferred from their background. Often overlaps with sense 1 in phrases like 身元が確か (of good character/background).
