At least, not by name.

I'm fine with the mechanic (consumable, regenerates itself, pool grows when leveling up).

But I'm not ok with the name.

Mana is so universal that, with the other classes having unique resources, it doesn't feel right. If even the mage, the mana user for excellence, can get a new resource, why should the witch doctor keep with the old resource?

I would suggest renaming it to something more in the style of the class (sorcery? witchery? voodoo? you get the idea) and maybe, change its color, too. Green would be fine.

Well, opinions and/or suggestions? :)

The resource UI never moves. You could cut out a piece of yellow cellophane and tape it over the mana resource circle, turn it green, and then call it whatever you want. :)

Really it's called mana because it is the classic mana mechanic, which works well for the witch doctor.