Nguyễn Nhạc
Lữ had two brothers: Emperor Thái Đức, common name Nguyễn Nhạc; and Emperor Quang Trung, common name Nguyễn Huệ. According to "Đại Nam chính biên liệt truyện", the three brothers, listed from eldest to youngest, were Nguyễn Nhạc, Nguyễn Lữ, Nguyễn Huệ; However, other source reported that he was the youngest one among Tây Sơn brothers. He had two nicknames: "thầy Tư Lữ" (Fourth Master Lữ ) and "Đức ông Bảy" (Virtuous Sir Seven).