Christian name

A few years ago when i was still in church, i was water baptized,
and my baptism name was "Justus", the reason being that the name was unique and it is a pretty nice name.
However many people did not know that my first choice for christian name was "Kelvin", i liked it because it matches my initial and i thought that the name was really nice.
So, why did i not choose "Kelvin" and chose "Justus" instead?
The truth is that during the year of baptism, i know of a few people who have the christian name "Kelvin", so if i chose "Kelvin" as my baptism name, it will be pretty awkward when we meet each other.

Now that i have left church, when people ask if i have a christian name, i will still tell them that it is "Justus".
Majority did not know how to pronounce it and finds it hard to call me by that name, so i stop introducing my christian name to them.

This 3 days i have been working daily, and when i log into my account in the cashier, my colleague will ask me who is "Justus", and i will tell them that "Justus" is my christian name.
Most of them will just laugh and say "Just Us", i get it how people will just pronounce it that way, it is not a common christian name.
So i told my colleague to call me "Kelvin", well its kind of funny because everyone of us are having fun and they have been calling me "KK" for many months.
Now that some of them call me "Kelvin" it makes my initial KKK "Ku Klux Klan".
Its kind of funny, maybe i should just change my name into "Justus Kelvin Lim"
What do you think?