who was the wahhabist tribal leader who won control of the arabian peninsula and founded the kingdom of saudi arabia
Saudi Arabia is named after the ruling family: the Saud family.
This family goes back to 18th century, and one of its members gained control of the Arabian Peninsula and founded a kingdom:
His name was Abdulaziz Ibn Saud. In the Arab world, he's known mostly as Abdulaziz and in the western World as "Ibn Saud".