In Arabic, "umm" means "mother" and is commonly attached as a prefix to geographic features. The second word, "qahab", is a local term used for white and light grey hills, of which there are a number found in this area.[1]
Alternative transliterations of its name are Umm Al Gahab and Umm Al Quhab.
References
^ abc"Geportal". The Centre for Geographic Information Systems of Qatar. Retrieved 1 March 2018.