punctuator
/ˈpʌŋ(k)tʃʊeɪtə/ /ˈpʌŋ(k)tjʊeɪtə/noun
1With reference to Semitic writing systems: a person who inserts points indicating vowel and accentuation signs; especially a person who was the first to do this, as, in Hebrew, any of the Masoretes.
2A person who inserts punctuation marks into text; a user of punctuation.
Origin
Mid 17th century; earliest use found in Brian Walton (1600–1661), bishop of Chester and biblicist. Apparently from punctuate + -or.