Who asked God to bless him and enlarge his territory, and God granted his request?

Answer: Jabez

Jabez, more honorable than his brothers, prayed for blessing, more territory and protection from harm, and God granted it.

“Now Jabez was more honorable than his brothers. His mother had named him Jabez, saying, “Because I bore him in pain.””— 1 Chronicles 4:9 (BSB)