सगर

• (Vedic) IPA^(key): /sɐ.ɡɐ.ɾɐ/
• (Classical Sanskrit) IPA^(key): /ˈs̪ɐ.ɡɐ.ɾɐ/

Of uncertain origin.

Probably a compound word. Its first component is most likely स- (sa-, conjunction prefix); compare the usage of the related सम्- (sam-, “together”) in समुद्र (samudra, “sea”).

The second component has a more ambiguous interpretation. Various theories have been proposed:

• From गॄ (gṝ, “to devour”), whence गर (gara, “swallowing; a beverage”).
• From the same root that जल (jala, “water”) comes from, perhaps गल् (gal, “to drip”).
• Related to Ancient Greek ᾰ̓γορᾱ́ (agorā́, “assembly”).
• Less likely, from गॄ (gṝ, “to invoke, call; welcome, pronounce”), with the interpretation of the full word as "accompanied by praise".

सगर • (sagara) stem, m

1. (rare) ocean

Rare in practice. Its vṛddhi derivative, सागर (sāgara), is used much more frequently instead.

Compound of स- (sa-, “with”) +‎ गर (gará, “poison”).

सगर • (sagara) stem, m

1. (Hinduism) Sagara, a king of Ayodhya, and the father of Asamanjasa.

• Mayrhofer, Manfred (1996) Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan]‎ (in German), volume 2, Heidelberg: Carl Winter Universitätsverlag, page 685
• Mayrhofer, Manfred (1976) Kurzgefasstes Etymologisches Wörterbuch des Altindischen [A Concise Etymological Sanskrit Dictionary]‎ (in German), volume 3, Heidelberg: Carl Winter Universitätsverlag, page 414