Where does “déogur” come from?

déogur (Old Irish) comes from Ancient Greek δίφθογγος, from Ancient Greek δί-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

déogur (Old Irish): diphthong

Definitions

diphthong

Ancestry of “déogur”, step by step

déogur traces back through two separate lines of ancestry.

via Ancient Greek δίφθογγος

Step	Language	Word	Meaning
1	Ancient Greek	δίφθογγος	with two sounds; a diphthong
2	Ancient Greek	δί-	Twice, double
3	Ancient Greek	διά	throughout
4	Proto-Indo-European	dwís	twice, doubly; in two
5	Proto-Indo-European	dwóh₁	two

via Old Irish fogur

Step	Language	Word	Meaning
1	Old Irish	fogur	a sound
2	Proto-Celtic	uɸo-gar-os	—
3	Proto-Indo-European	ǵeh₂r-	to shout, cry; exclamation; voice; to call, cry

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