My real name is Mariam which is the Arabic meaning of Mary. My name basically means Mother of Isa (Jesus). I'm a Muslim born, didn't had any choice over my name but am not always very happy with my name though, don't know why I'm usually sad, depressed and never happy even how many times I try to be happy, it just never comes. I also don't like my sur/last name because of having a not so good caring father who always treated us as if we were his step kids. I always wanted to change my name to any beautiful meaning though. I love the meaning of lucky, Angel, God gifted, beautiful or more than beautiful. God gifted best describes me as an individual because Allah (swt) gave me a gift of having colorful eyes and a very fair skin complexion completely out of my parents genes. Personality-wise, a lot of people say I'm sweet, responsible, loving and caring and down to earth.
My friend had converted/reverted to Islam mash Allah subhanAllah and I think the Muslim name he chose is Sultan but his real name means water. My question is, if his non-Muslim name means Water, is that ok?
My other question, is it ok if I change my surname to my mom's sur/last name?