Where does “Mare Tranquilitātis” come from?

Mare Tranquilitātis (Latin) comes from Latin tranquillitās, from Latin Tranquillus, from Latin trānsquīlus, from Latin quiēs, from Proto-Italic kʷiētis, from Proto-Indo-European kʷyéh₁tis, from Proto-Indo-European kʷyeh₁- — to rest; rest, peace.

Ancestry of “Mare Tranquilitātis”, step by step

Mare Tranquilitātis traces back through two separate lines of ancestry.

via Latin tranquillitās

StepLanguageWordMeaning
1Latintranquillitāsquietness, calmness, stillness, tranquillity, serenity
2LatinTranquillusquiet, calm, still, tranquil
3Latintrānsquīlus—
4Latinquiēsthe rest of sleep, repose
5Proto-Italickʷiētis—
6Proto-Indo-Europeankʷyéh₁tis—
7Proto-Indo-Europeankʷyeh₁-to rest; rest, peace

via Latin mare

StepLanguageWordMeaning
1Latinmaresea; ablative singular of mās
2Proto-Italicmarisea
3Proto-Indo-Europeanmórisea; standing water
4Proto-Indo-Europeanmer-to die; to disappear; sea, lake, wetland
Every word from Proto-Indo-European kʷyeh₁- →Every word from Proto-Indo-European kʷyéh₁tis →Every word from Proto-Italic kʷiētis →