Where does “ダブル立直” come from?

ダブル立直 (Japanese) comes from Japanese ダブル, from English doublé, from French doublé, from Middle French double, from Old French doble, from Latin dūplus, from Proto-Italic *duplos — double.

ダブル立直 (Japanese): a 役 for declaring a ready hand on the first go-around of play, worth 2 翻

Definitions

a 役 for declaring a ready hand on the first go-around of play, worth 2 翻

Ancestry of “ダブル立直”, step by step

ダブル立直 traces back through two separate lines of ancestry.

via Japanese ダブル

Step	Language	Word	Meaning
1	Japanese	ダブル	double
2	English	doublé	A compound attack that deceives the opponent's...
3	French	doublé	double, brace, pair; double; doublé
4	Middle French	double	—
5	Old French	doble	double
6	Latin	dūplus	double (twice as much, or as big)
7	Proto-Italic	*duplos	double

via Japanese 立直

Step	Language	Word	Meaning
1	Japanese	立直	riichi, a completed by declaring the hand to be, waiting for one more tile to win; can potentially also score and
2	Chinese	立直	riichi

Every word from Proto-Italic *duplos →