Where does “Tilly” come from?

I appreciate the detailed instructions, but I need to flag a problem: the provided chain doesn't support an etymology for "Tilly" as an English word. The chain traces "-ity" suffix morphology (utility → utile → French -ité → Latin -itas, etc.), which is unrelated to the proper noun or common noun "Tilly." I cannot write an accurate one-sentence summary because: 1. The chain supplied doesn't etymologically connect to "Tilly" 2. The known meaning is listed as "(unknown)" 3. Creating a connection would violate the rule "State only what the chain supports" Could you provide the correct etymological chain for "Tilly," or clarify what word this chain actually describes?

Tilly (English): Alternative letter-case form of tilly

Definitions

  1. Alternative letter-case form of tilly

Ancestry of “Tilly”, step by step

Tilly traces back through 3 separate lines of ancestry.

via English utility

StepLanguageWordMeaning
1EnglishutilityThe state or condition of being useful;...
2Middle Englishutilitebenefit, gain, profit
3Old Frenchutilite
4Latinūtilitasusefulness, utility
5Latinūtilisuseful, serviceable, beneficial, profitable, advantageous; helpful
6Latinūtorto use, make use of, employ
7Proto-Slavic*ǫtorъcroze
8Proto-Slavictorъpaddock, pen
9Proto-Slavictertito rub, to scrape; to polish
10Proto-Indo-Europeanterh₁-to rub, turn; to drill, pierce

via English till

StepLanguageWordMeaning
1EnglishtillUntil; to, up to; as late as; To, up to; To make...
2Middle EnglishtilyenTo cultivate or ready soil for planting; to till;...
3Old Englishtilianto obtain; to strive; to provide for
4Proto-GermanictilōnąTo strive; reach; mint; aim; hurry

via Irish tuilleadh

StepLanguageWordMeaning
1Irishtuilleadhadding to, increasing; addition, increase; more;...
2Old Irishtuilledincreasing, adding to; increase, additional...
3Old Irishdo·línaincreases, adds to

Words derived from “Tilly

Every word from Proto-Indo-European terh₁-Every word from Proto-Slavic tertiEvery word from Proto-Slavic torъ
Tilly — Etymology, Origin & Word History | Etymology Explorer