Wa Alaikum As'salam dear brother Ibn Layla,
Jazaka Allah Khayr and welcome to the board, akhi. Great discovery! One of Islam's names in the Glorious Quran is SILM:
"O ye who believe! Enter into Islam (?? 
?? into the Selm (another name for Islam)) whole-heartedly; and follow not the footsteps of the evil one; for he is to you an avowed enemy." (The Noble Quran, 2:208).https://www.answering-christianity.com/ac.htm#capsule
So SHILM in Genesis 17 is being a Muslim. I will add to the website and do further research, insha'Allah.
Take care,
Osama Abdallah
