In the eighth episode of the second season of Narcos when Murphy and Pena are interrogating Blackie the following dialogue can be heard:
Pena: Blackie Blackie, Blackie, Blackie. [Sighs] What name did your mother give you?
Blackie: Nelson Hernandez... Lucumi.
Pena: Lucumi? From the Pacific. Lucumi, they found explosive residue on your hands. On your jacket, everywhere. They're going to blame you for that bomb, Lucumi.
What made me curious about this is that both Murphy and Pena are initially surprised when hearing this unusual, African-sounding name, but then Pena quickly associates it with the Pacific.
I've done a quick research and found Lucumí people, but they live in Cuba, so have no association with the Pacific ocean.
Then I found this explanation from the book Afro-Latino Voices: Translations of Early Modern Ibero-Atlantic Narratives: lucumi was a term used by transatlantic slave traders to identify slaves that the Yoruba tribe was selling to them and was used as a self-identification term by the descendants of these slaves, that lived in Western South America and called themselves de casta lucumi ("of the Lucumi caste").
This one definitely seems related, but if Lucumi is not a family name, but a name of the people (or "caste") then why Blackie gave it as a name that his mother gave him and Pena was referring to him using it?
Could someone having knowledge on Colombian/South American culture explain that?
Edit: The information about lucumi being a name of the slaves of Yoruba origin can also be found in Spanish language Wikipedia (provided that the Google translation got it right). However both sources refer to a term used in 18th century, I didn't found any information regarding its current use, apart from being an actual family name.