Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 1 year ago

There is historical evidence that some people practiced it in ancient times. I'm sure you can find some reliable historical sources on this subject using the Internet!

(It is good to avoid the temptation of making generalizations about the past, people have lived in many places for many thousands of years, and in many cases we have little or no written/archaeological evidence about how they lived. What can be said is it is recorded or alluded to in some places.)

Many things are not discussed directly in the Qur'an as much of the Qur'an is about general principles and not specifics. The Qur'an also does not discuss male circumcision. Perhaps one could apply the general principle of not causing harm. 

There are some Shi'a hadith indicating that circumcision is for males only and not for females.