Inspector Redwood is what I go by and here's my blog. FIlled with Korra, Homestuck and some Misc. But the definitive one stop shop for all information on The Legend of Korra.
theothermadi answered:
I went back and listened it just sounded like he made the “Ma-” to short and put emphasis on the “-kooo” I wish I could respond with audio
lastingaster answered:
That’s what I heard too, but I think it was just the announcer’s accent.
electronbendinggirl answered:
I’m pretty sure it’s Mah-ko (I had to double check the Comic Con panel to be sure)