Where does “mustadelfiini” come from?

mustadelfiini (Finnish) comes from Finnish delfiini, from Swedish delfin, from German delphin, from Latin delphīnus, from Ancient Greek δελφίν, from Ancient Greek δελφύς, from Proto-Indo-European gʷelbʰ- — the womb.

Ancestry of “mustadelfiini”, step by step

mustadelfiini traces back through two separate lines of ancestry.

via Finnish delfiini

Step	Language	Word	Meaning
1	Finnish	delfiini	short-beaked common dolphin, "Delphinus delphis";...
2	Swedish	delfin	dolphin
3	German	delphin	dolphin
4	Latin	delphīnus	a dolphin an aquatic mammal of the family
5	Ancient Greek	δελφίν	—
6	Ancient Greek	δελφύς	the womb
7	Proto-Indo-European	gʷelbʰ-	the womb

via Finnish musta

Step	Language	Word	Meaning
1	Finnish	musta	black; black horse; Elative singular form of...
2	Finnish	-ntää	Front vowel variant of -ntaa

Every word from Proto-Indo-European gʷelbʰ- →Every word from Ancient Greek δελφύς →Every word from Ancient Greek δελφίν →