The Proto-Semitic word ʾab
Word ʾab
Meaning father

Comments
Kaye, Alan S. "Christopher Ehret. Reconstructing Proto-Afroasiatic (Proto-Afrasian): Vowels, Tone, Consonants, and Vocabulary", University of California 2079

Other words that might be of interest
ʔns ‘person, man’, ʾin(a)š ‘man’, ʾam ‘maid, girl’, nišw ‘woman’, ʾaḫ ‘brother’, bar ‘son’, bin ‘son’, walad ‘boy, child’