Where does “Guadiana” come from?

Guadiana (English) comes from Spanish Guadiana, from Old Spanish Aguadiana, from Latin Anas, from Latin ānus, from Kabuverdianu anos, from Portuguese nós, from Old Portuguese enos, from Old Portuguese os — that.

Ancestry of “Guadiana”, step by step

StepLanguageWordMeaning
1SpanishGuadiana—
2Old SpanishAguadiana—
3LatinAnasduck
4Latinānusa ring
5Kabuverdianuanoswe, first person plural
6Portuguesenóswe; us; "first-person plural objective personal...
7Old Portugueseenos—
8Old Portugueseosthe
9Vulgar Latin*lōs—
10Latinillōs—
11Latinillethat; those; "; demonstrative pronoun "; that...
12LatinolleArchaic form of ille
13Proto-Italic*olnosthat
Every word from Proto-Italic *olnos →Every word from Latin olle →Every word from Latin ille →