The GetNames(v) calling sequence returns the coordinate variable names of the Vector v as a list of strings.

$\mathrm{with}\left(\mathrm{VectorCalculus}\right)\:$

$\mathrm{v1}≔\mathrm{Vector}\left(⟨\sin \left(t\right)\,\cos \left(t\right)\,t^2⟩\right)$

$\mathrm{GetNames}\left(\mathrm{v1}\right)$

$\left[''x''\,''y''\,''z''\right]$

$\mathrm{v2}≔\mathrm{VectorField}\left(⟨x\,y⟩\,\mathrm{cartesian}\left[x,y\right]\right)$

$\mathrm{GetNames}\left(\mathrm{v2}\right)$

$\left[''x''\,''y''\right]$

$\mathrm{GetNames}\left(\mathrm{PositionVector}\left(\left[x\,y\right]\right)\right)$

$\left[''x''\,''y''\right]$

$\mathrm{GetNames}\left(\mathrm{RootedVector}\left(\mathrm{root}=\left[u\,v\right]\,⟨x\,y⟩\right)\right)$

$\left[''x''\,''y''\right]$

The VectorCalculus[GetNames] command was updated in Maple 2017.