Where does “Mustānum” come from?

Mustānum (Livonian) comes from Livonian mustā, from Proto-Finnic musta — black.

Ancestry of “Mustānum”, step by step

Mustānum traces back through two separate lines of ancestry.

via Livonian mustā

StepLanguageWordMeaning
1Livonianmustāblack
2Proto-Finnicmustablack

via Livonian num

StepLanguageWordMeaning
1Livoniannumheather
Every word from Proto-Finnic mustaEvery word from Livonian mustā