Mohammad (SAW) married the daughter of Umar, named Hafsah. Therefore, he is technically the father-in-law of Muhammad. However, he referred to himself in more humble terms.
Yahya ibn Idris ibn Umar died in 917.
Sayf ibn Umar died in 796.
Ali ibn Umar died in 883.
Umar ibn Hafsun died in 918.
Umar ibn Hafsun was born in 850.
Yahya ibn Umar died in 864.
Al-Qadi Aqib ibn Mahmud ibn Umar died in 1627.
Al-Qadi Aqib ibn Mahmud ibn Umar was born in 1556.
Umar Ibn Muhammad of Borno died in 1967.
Abû 'Umar ibn Sa'îd died in 1287.
Umar Ibn Abi Rabi'ah was born in 644.
Yahya ibn Umar al-Lamtuni died in 1056.