Where does “blue swallow” come from?

blue swallow (English) comes from English Blue, from Middle English blēwe, from Anglo-Norman blew, from Middle French bleu, from Old French blöe, from Latvian blāvus, from Old High German blāo, from Proto-West Germanic blāu — yellow, blond, grey.

blue swallow (English): Hirundo atrocaerulea, a species of swallow

Definitions

  1. Hirundo atrocaerulea, a species of swallow

Ancestry of “blue swallow”, step by step

blue swallow traces back through two separate lines of ancestry.

via English Blue

StepLanguageWordMeaning
1EnglishBlueA letterman at Oxford or Cambridge; A member of...
2Middle Englishblēwe
3Anglo-Normanblewblue
4Middle Frenchbleublue
5Old Frenchblöeblue
6Latvianblāvusaccusative plural masculine form of blāvs
7Old High Germanblāoblue, dark, grey; blue; yellow
8Proto-West Germanicblāublue
9Proto-Germanicblēwazblue; a dark bluish or grey colour, black
10Proto-Indo-Europeanbʰlēw-yellow, blond, grey

via English swallow

StepLanguageWordMeaning
1EnglishswallowTo cause to pass from the mouth into the...
2Middle EnglishswalweA swallow or a swift; The meat of such birds
3Old Englishswealweswallow
4Proto-West Germanic*swalwāswallow (bird)
5Proto-Germanicswalwǭswallow
Every word from Proto-Indo-European bʰlēw-