Where does “birthday buddy” come from?

birthday buddy (English) comes from English Buddy, from English -y, from Middle English -y, from Old English -iġ, from Proto-West Germanic -g, from Proto-Germanic -gaz, from Proto-Indo-European -ḱos — -y, -ic.

birthday buddy (English): A person who shares the same birthday as another person

Definitions

  1. A person who shares the same birthday as another person

Ancestry of “birthday buddy”, step by step

birthday buddy traces back through two separate lines of ancestry.

via English Buddy

StepLanguageWordMeaning
1EnglishBuddyA male nickname
2English-yAdded to nouns and adjectives to form adjectives...
3Middle English-yDesignates an adjective, in many cases formed by...
4Old English-iġ-y, -ic
5Proto-West Germanic-gForms adjectives from nouns and verbs with a...
6Proto-Germanic-gaz-y
7Proto-Indo-European-ḱos-y, -ic

via English birthday

StepLanguageWordMeaning
1EnglishbirthdayThe anniversary of the day on which someone is...
2Middle Englishbirthdai
3Old Englishġebyrddæġbirthday
Every word from Proto-Indo-European -ḱos
birthday buddy — Etymology, Origin & Word History | Etymology Explorer