Where does “diadochus” come from?

diadochus (English) comes from Ancient Greek διάδοχος, from Ancient Greek διαδέχομαι, from Ancient Greek δῐᾰ-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

diadochus (English): Any of the rival families who fought for control over Alexander the Great's empire after his death

Definitions

Any of the rival families who fought for control over Alexander the Great's empire after his death

Ancestry of “diadochus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	διάδοχος	succeeding a person in a thing, aftercoming;...
2	Ancient Greek	διαδέχομαι	to succeed
3	Ancient Greek	δῐᾰ-	apart; through, across; through; in different...
4	Ancient Greek	διά	throughout
5	Proto-Indo-European	dwís	twice, doubly; in two
6	Proto-Indo-European	dwóh₁	two

Every word from Proto-Indo-European dwóh₁ →Every word from Ancient Greek δῐᾰ- →Every word from Proto-Indo-European dwís →