BUCUJA has been found as a Romanian family name.
My suggestion for KIEL is Ezechiel / Yehezquiel.
KIEL might be a nickname based on the end of Yehezquiel, just like :
ALEXANDER => SANDER / SASHA
AKIVA => KIVA / KIVE
ANATOLY => TOLIA
ANTONY => TONY
PATRICIA => TRICIA
Thus the searched person is possibly
The vowels may be different, of course.
This is my best guess.