Where does “sea violet” come from?

sea violet (English) comes from English sea, from Middle English see, from Old English sǣ, from Proto-West Germanic saiwi, from Proto-Germanic saiwiz, from Proto-Germanic sīhwaną, from Proto-Indo-European seykʷ-, from Proto-Indo-European sey- — to be wet; dribble; run; to stretch one's arm;...

Ancestry of “sea violet”, step by step

sea violet traces back through two separate lines of ancestry.

via English sea

StepLanguageWordMeaning
1EnglishseaA large body of salt water; A lake, especially if...
2Middle Englishseesea, ocean; A body of water, a lake; seat, chair
3Old Englishsea, lake
4Proto-West Germanicsaiwisea
5Proto-Germanicsaiwizsea, ocean
6Proto-Germanicsīhwanąto filter
7Proto-Indo-Europeanseykʷ-to moisten; to filter
8Proto-Indo-Europeansey-to be wet; dribble; run; to stretch one's arm;...

via English violet

StepLanguageWordMeaning
1EnglishvioletA plant or flower of the genus "Viola",...
2FrenchVioletteviolet plant
3Old Frenchvioletteviolet
4Old French-etteAlternative form of -ete
5Latin-itta
6Hungarianiszikto drink
7Proto-Uralicjëxe-to drink; to flow?
Every word from Proto-Indo-European sey-Every word from Proto-Indo-European seykʷ-Every word from Proto-Germanic sīhwaną