Yu: The original meaning of the word Yu refers to the eaves of houses, and later refers to the boundaries and spaces or boundaries of houses, describing people's manners.
"Shuo Wen Jie Zi" explains the cloud: Zhai Ye. From the sound. "Yi" said, "Go to the next building."
Gentleman: It means having culture and status.
"Shuo Wen Jie Zi" says: Great belt also. From the sound.