Where does “Delta” come from?

Delta (English) comes from Ancient Greek δέλτα, from Phoenician 𐤃, from Egyptian 𓉿.

Ancestry of “Delta”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	δέλτα	delta, the name for the fourth letter Δ, δ of the...
2	Phoenician	𐤃	dalet; daleth
3	Egyptian	𓉿	—

Delta — Etymology, Origin & Word History | Etymology Explorer