Where does “all righty” come from?

all righty (English) comes from English Y, from English yuri, from Japanese 百合, from Japanese 連用形, from Japanese 見る, from Japanese 夢, from Old Japanese 夢, from Japanese 目.

Ancestry of “all righty”, step by step

all righty traces back through two separate lines of ancestry.

via English Y

StepLanguageWordMeaning
1EnglishYA figure or mark in the shape of the letter Y; A...
2EnglishyuriA narrative or visual work featuring a romance or...
3Japanese百合lily
4Japanese連用形an inflectional category: the continuative or...
5Japanese見るto see, to watch, to observe, to look at...
6Japanesea dream; a vision; leaving reality to the state...
7Old Japanesea dream
8Japanesean order in biology: smaller than a class, bigger...
9Middle Chinese

via English all right

StepLanguageWordMeaning
1Englishall rightGood; in acceptable, if not excellent condition;...
Every word from Middle Chinese