A phenomenon called the bouba/kiki effect has been observed, where people tend to associate the nonsense words “bouba” and “kiki” with specific shapes, with “bouba” linked to rounded shapes and “kiki” to spiky shapes. This mental association has been found across cultures, including young children and even infants, suggesting it may precede language learning. Surprisingly, this effect extends to other contexts, such as when pairing words with evaluative meanings or existing first names. While the bouba/kiki effect is widespread, it does not occur in all communities, and languages like Mandarin Chinese, Turkish, and Romanian do not exhibit this association. This effect has implications for understanding language evolution and the neurological basis for sound symbolism.
https://en.wikipedia.org/wiki/Bouba/kiki_effect