Re: your last name is Khan, really?
Trouble here is not surname but name 
We have unisexual name, jaskirat, lovepreet, jaspreet, gurkeerat only difference that can be made is through singh and kaur, which differentiate the two
So in punjab classroom if you ask a question, “who is gurkeerat here”
5 people may standup, 3 boys and 2 girls