Rafał Mantiuk *
In latex:
Rafa{\l} K. Mantiuk
for English speakers: rafaw mantuk (u as in you)
Of note:
I do not mind if my name is spelled Rafal instead of Rafał. Feel free to use whatever spelling you prefer.
From 2012 I started adding my middle name initial not to be confused with my brother who has the same initials: Radosław Mantiuk.