"Motion" is too close to "Move" in meaning and look (both start with Mo).
Natal means nothing to people and it can't be used as a play on words like Wii.
So it'll be something else, probably something that connotes freedom without being called "Freedom". "Freedom" wil only appeal to Americans if it has "fries" after it, and it won't resonate with anyone else
The XBox Liberator
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix