I don’t have an English name and my name has the “cha” sound in it and yeah some people can’t pronounce it and it takes until they say my last name when I turn around because they come up with weird sounds instead of it. Overall though, a lot of people nowadays can say “cha”, you’d be surprised.
Another option is to give them a middle name that’s easy to pronounce. Then the kid can just be call me (fill in the blank) instead, it’s easier.