NAMY (as you already mentioned) is the code number for mocha nappa leather. This is the color code for the interior on my 2014 f15 X5.
You can check if this is what you have if you decode your VIN at one of the VIN decoding sites like
www.bimmer.work or
www.mdecoder.com
And you can also check one of the online part database sites (like bimmercat) that should list the offered leather material codes. I believe Dakota leather is
LCMY (if you have mocha)…and Nappa leather is
NAMY.
EDIT: yep….you can see the color code for Mocha Nappa leather is NAMY in the screen shot from the bimmercat.com website: