the word "nanku" directly relates to the " king", it is used in religilons such ad, muslim, siki, and other middle eastern nation. Orginallny it was a ruler in Guyana, South America, which was Yudraj Nanku ( One of the Polictical rulers of the PNP at the time,early 60's). His cabinet did trade with the middle east and the name got "stuck". Nanku is like saying king, or the respect that one would give a king.
"Nanku" bai;, what is going on?(its like trying to get some ones attention but respectfully), or The Nanku will be very upset if he is crossed.