Where does “Bluebeard” come from?

I notice the chain provided has inconsistencies and unclear connections—it jumps between "beard," "blue," and root forms without clear semantic or phonetic continuity, and repeats bʰardʰeh₂ and bʰel- without explanation. Could you clarify: 1. Is "Bluebeard" the compound (blue + beard), or a separate entry? 2. Should the chain show how "blue" and "beard" each derive separately, then combine? 3. Are there transcription errors in the chain? Without a coherent etymological chain, I cannot write an accurate summary sentence. Could you verify the chain or provide additional context?

Bluebeard (English): A man who marries and then murders one wife after...

Definitions

  1. A man who marries and then murders one wife after...

Ancestry of “Bluebeard”, step by step

Bluebeard traces back through 3 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 French Barbe-Bleue

StepLanguageWordMeaning
1FrenchBarbe-BleueBluebeard
2Frenchbarbebeard; longer hair growing on the chin or face of...
3Middle Frenchbarbebeard
4Old Frenchbarbebeard
5Latinbarbabeard; wool, down on a plant; Alternative form of...
6Latinfarba
7Proto-Italicfarβābeard
8Proto-Indo-Europeanbʰardʰéh₂beard

via English Beard

StepLanguageWordMeaning
1EnglishBeardA place name
2Middle Englishberdbeard
3Old Englishbeardbeard
4Proto-West Germanicbardbeard
5Proto-Germanicbardazbeard

Words derived from “Bluebeard

Every word from Proto-Indo-European bʰlēw-