Analysis of information sources in references of the Wikipedia article "Uruguay" in English language version.
In the meantime, while the crowd assembled in the plaza continued to shout its demands at the cabildo, the sun suddenly broke through the overhanging clouds and clothed the scene in brilliant light. The people looked upward with one accord and took it as a favorable omen for their cause. This was the origin of the ″sun of May″ which has appeared in the center of the Argentine flag and on the Argentine coat of arms ever since.
uruguay by leslie jermyn.
The word itself, 'Uruguay', is clearly derived from the Guaraní, probably by way of the tribal dialect of the Charrúas [...] from uru (a generic designation of wild fowl)
In Paraguay the Guaraní Indians call a fowl uruguaçú. The Cainguá in Misiones only say urú. [...] A few Guaraní-speakiug Indians who call a hen uruguasu and a cock tacareo. Uruguaçu means "the big uru".
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: CS1 maint: url-status (link)The word itself, 'Uruguay', is clearly derived from the Guaraní, probably by way of the tribal dialect of the Charrúas [...] from uru (a generic designation of wild fowl)
In Paraguay the Guaraní Indians call a fowl uruguaçú. The Cainguá in Misiones only say urú. [...] A few Guaraní-speakiug Indians who call a hen uruguasu and a cock tacareo. Uruguaçu means "the big uru".