Where does “millardito” come from?

millardito (Spanish) comes from Spanish millardo, from French milliard, from French million, from Middle French million, from Old French millon, from Italian milione, from Italian mille, from Latin Mīlle.

Ancestry of “millardito”, step by step

Step	Language	Word	Meaning
1	Spanish	millardo	billion, milliard
2	French	milliard	A milliard
3	French	million	million, 10
4	Middle French	million	million, 10
5	Old French	millon	—
6	Italian	milione	million
7	Italian	mille	thousand
8	Latin	Mīlle	thousand; 1000
9	Proto-Italic	smīɣeslī	thousand
10	Proto-Indo-European	smih₂ǵʰéslih₂	—

Every word from Proto-Indo-European smih₂ǵʰéslih₂ →Every word from Proto-Italic smīɣeslī →Every word from Latin Mīlle →