Strong’s Greek
G540 — apator
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀπάτωρ
apator — pronounced ap-at'-ore
from 1 (as a negative particle) and 3962; fatherless, i.e. of unrecorded paternity:--without father. see GREEK for 1 see GREEK for 3962
1 occurrence in the KJV.
Hebrews 7:3
Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.