baronet
/ˈbærənɪt/- a member of the lowest hereditary titled British order, with the status of a commoner but able to use the prefix 'Sir'准男爵（英国级别最低的世袭头衔之一, 平民身份, 但可在姓氏前加Sir）。
词源
late Middle English: from Anglo-Latin baronettus, from Latin baro, baron- 'man， warrior'. The term originally denoted a gentleman， not a nobleman， summoned by the king to attend parliament; the current order was instituted in the early 17th cent.