Where does “sierran” come from?

sierran (Spanish) comes from English Sierra, from Spanish Sierra, from Latin serra, from Proto-Italic serzā, from Proto-Indo-European sers-eh₂, from Proto-Indo-European sers-, from Proto-Indo-European ser- — to flow; to guard; to bind, to tie together.

Definitions

Ancestry of “sierran”, step by step

sierran traces back through two separate lines of ancestry.

via English Sierra

StepLanguageWordMeaning
1EnglishSierraof modern American usage, from the Spanish noun, confused with Ciara and Sarah
2SpanishSierrasaw tool
3Latinserraa saw; a kind of sawfish; a serrated battle order
4Proto-Italicserzā
5Proto-Indo-Europeansers-eh₂
6Proto-Indo-Europeansers-to cut off
7Proto-Indo-Europeanser-to flow; to guard; to bind, to tie together

via English ān

StepLanguageWordMeaning
1Englishān
2Middle Englishāna, an indefinite article
3Old Englishānlonely; entirely alone, solitary, single; one
4Proto-West Germanicainone
5Proto-Germanicainazone; some
6Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European ser-