My Very Difficult Name

Many people in the Czech Republic are never actually called by their real names. Their names can be modified by adding something like -ka to girl's names and -ek to guy's names. For example: Hana could be Hanka and Jaromir could be Jarek. Sometimes it is good because the nickname is easier than the real name but sometimes the opposite is true.

However, this leads to an interesting problem sometimes when I introduce myself.

Person: What is your name?
me: Aruna
Person: That name is very hard for Czech people to say, isn't there something easier?
me: [after having this conversation many, many times before and realizing that for some convoluted reason this is actually much easier for some people] You can call me Arunka.

At first I said, "No, I don't have a nickname. It's just Aruna." But they called me Arunka anyway. I actually kind of like it now. It sounds soooo Czech! I guess adopting this Czech name makes up for the fact that I've been here 4 months and can't really speak any Czech. Right?