Three other nouns — ndigiri (donkey), mocinga (gun), mokandá (rope) have tone patterns as indicated (in the system used here and elsewhere in this article for Bantu tone, low syllables are unmarked, high syllables have an acute accent, and rising syllables a haček respectively; thus a, á, ǎ).
1967 July, The Bodleian Library Record (J. Johnson), volume VIII, number 1, page 3
Its keyboard includes a fair selection of the diacritical marks needed for cataloguing: the acute, grave, and circumflex accents, the cedilla, diæresis, short-sign, tilde, haček, and superscript circle.
It seems, though, that Gaj’s incentive for the graphical shape of his letters was a native source. This can be seen in his use of the tilde rather than the “haček” (ˇ), as is often incorrectly claimed.