  This paper concerns the enumeration of simultaneous conjugacy classes of
tuples of commuting unitary matrices and of commuting symplectic matrices over
a finite field $\mathbf{F}_q$ of odd size. For any given conjugacy class, the
orbits for the action of its centralizer group on itself by conjugation are
called branches. We determine the branching rules for the unitary groups
$U_2(\mathbf{F}_q), U_3(\mathbf{F}_q)$, and for the symplectic groups
$Sp_2(\mathbf{F}_q), Sp_4(\mathbf{F}_q)$.
