New in version 2.0.
For positive n, return namesake to the right of component:
abjad> t = Staff("c'8 d'8 e'8 f'8")
abjad> componenttools.get_nth_namesake_from_component(t[1], 1)
Note("e'8")
For negative n, return namesake to the left of component:
abjad> t = Staff("c'8 d'8 e'8 f'8")
abjad> componenttools.get_nth_namesake_from_component(t[1], -1)
Note("c'8")
Return component when n is zero:
abjad> t = Staff("c'8 d'8 e'8 f'8")
abjad> componenttools.get_nth_namesake_from_component(t[1], 0)
Note("d'8")
Return component or none.