a personal name, contains the elements "black" (tlil-), "reed" (aca-), and a reverential suffix; it could also have an -a- from water (atl) hiding in there (see attestations); the name also appears without the reverential suffix (-tzin)
one who has black [ink, for example]; this can be found in combination: tlileh tlapaleh, possessor of the black, the red, or one who paints/writes, a sage
Gran Diccionario Náhuatl, citing Wimmer 2004 who refers to the Florentine Codex; translated to English here by Stephanie Wood.