Where does “fansigning” come from?

fansigning (English) comes from English Fan, from English fanatic, from French fanatique, from Latin fānāticus, from Latin -aticus, from Latin -ātus, from Proto-Italic -ātos, from Proto-Indo-European -éh₂tos — Forms adjectives from nouns, indicating the possession of a thing or a quality.

Ancestry of “fansigning”, step by step

fansigning traces back through two separate lines of ancestry.

via English Fan

StepLanguageWordMeaning
1EnglishFanA diminutive of Frances
2EnglishfanaticFanatical; Showing evidence of possession by a...
3Frenchfanatiquefanatic, fanatical; fanatic
4Latinfānāticustemple
5Latin-aticusUsed to form adjectives indicating a relation to...
6Latin-ātused
7Proto-Italic-ātos
8Proto-Indo-European-éh₂tosForms adjectives from nouns, indicating the possession of a thing or a quality

via English signing

StepLanguageWordMeaning
1EnglishsigningThe act of concluding a contract, especially by...
2EnglishsignA visible indication; Physical evidence left by...
3Middle Englishsigne
4Old Englishseġnsign; mark; token
5Latinsignumvisible indication: sign, mark, signal; seal,...
6Proto-Italicseknomsign
7Proto-Indo-Europeansek-to cut, cut off, sever
Every word from Proto-Indo-European -éh₂tos