姫
キ, ひめ, ひめ
princess
JLPT1 G7 S10 F1566
The element now appearing as 臣(subject; retainer) was originally ?# as described in 煕 (confine in the jaw/mouth → confine). The addition of 女 woman indicated a woman confined within a palace (compare 嫁) → female palace slave. Via the intermediary sense of "courtly retainer," the character came to indicate a mistress, or court lady, and eventually a *princess*. *Honorific title for a woman of high rank* is by association.
[Full Kanji Etymology List]