Where does “anti-vaxer” come from?

anti-vaxer (English) comes from English anti-vax, from English vax, from English vaccine, from French vaccine, from Latin vaccīnus, from Latin -īnus, from Proto-Italic -īnos, from Proto-Indo-European -iHnos — adjectival suffix.

Ancestry of “anti-vaxer”, step by step

anti-vaxer traces back through two separate lines of ancestry.

via English anti-vax

StepLanguageWordMeaning
1Englishanti-vaxOpposing vaccines and vaccination
2EnglishvaxAbbreviation of vaccine; Abbreviation of...
3EnglishvaccineA substance given to stimulate the body's...
4Frenchvaccineinflection of vacciner: ## first/third-person...
5Latinvaccīnusof or derived from a cow; cow
6Latin-īnusof or pertaining to; -ine
7Proto-Italic-īnosof/belonging to
8Proto-Indo-European-iHnosCreates adjectives of materials
9Proto-Indo-European-no-adjectival suffix

via English ER

StepLanguageWordMeaning
1EnglishERThe statistic "Earned Run"; Initialism of...
2Turkisherearly; brave; man, male
3Ottoman Turkishایرsaddle, a seat for a rider placed on the back of a horse or other animal
4Old Anatolian Turkishایرearly, at a time in advance of the usual or expected event
5Proto-Turkicēdersaddle
Every word from Proto-Indo-European -no-Every word from Latin -īnusEvery word from Latin vaccīnus