At(index) should work, as it says in the manual, if Y and Z are not provided, then they are set to 0.
I think the problem comes from the initialization of your array. How do you fill it with names?
You need a one dimensional array of names. Personally, I would first set the size of the array to (NAMESCOUNT, 1, 1), where NAMESCOUNT is the number of names you have, then I would fill each X index with a string value.
Maybe you set the height or depth to 0 by mistake. From the manual : "If any of the dimensions are 0 the entire array is empty, so usually all the dimensions are at least 1."
Please provide a capx or a screenshot of your code at least for us to provide a more detailed answer.
Btw, you can read the manual for Array here : https://www.scirra.com/manual/108/array