Cecilio Agustín Robelo, a Mexican philologist from the beginning of the 19th century, was one of the first to be interested in the origin of this name, and had published the results of his research in his "Diccionario De Aztequismos" (Dictionary of
Aztequisms). In this book, he defines the tololoche as “Name that the Indians gave to the musical instrument called « Contrabass » when they saw its rounded shapes, and that it looked like an irregular spheroid". He considered that this name derived from the words, in the
Nahuatl language, “Tololo Tic”, which he interpreted as “round or spherical”. Cecilio Agustín Robelo's explanation is difficult to impose, because from that time on, botanists used the word "tololonchi" to designate the spherical fruits of various species of
Passiflora bryonioides, a variety of
Passifloras that grows in Mexican states of
Sonora,
Chihuahua,
Sinaloa and
Guanajuato, as well as in the American state of
Arizona. ==Terminology==