Where does “Semiticist” come from?

Semiticist (English) comes from English ist, from English -ist, from Old French -iste, from Latin -ista, from Ancient Greek -ιστής, from Ancient Greek -τής, from Proto-Hellenic -tās.

Ancestry of “Semiticist”, step by step

Semiticist traces back through two separate lines of ancestry.

via English ist

StepLanguageWordMeaning
1EnglishistA practitioner or supporter of an ism
2English-istAdded to words to form nouns denoting
3Old French-iste
4Latin-ista-ist; one who practises or believes
5Ancient Greek-ιστήςAlternative form of -τής; -ist
6Ancient Greek-τήςAppended to verbs to form agent nouns
7Proto-Hellenic-tās

via English Semitic

StepLanguageWordMeaning
1EnglishSemiticOf or pertaining to a subdivision of Afroasiatic...
2EnglishSemiteA member of a modern people that speak a Semitic...
3GermansemitischSemitic
4Ancient GreekΣήμShem, one of the sons of Noah
5HebrewשֵׁםShem; name; name of
6Hebrewשמואל
7Hebrewשְׁמוּאֵל
Every word from Proto-Hellenic -tāsEvery word from English -istEvery word from Ancient Greek -τής