The Spanish word 'primito' meaning 'little cousin' is formed from two parts: 'primo' (meaning 'cousin') and the diminutive suffix '-ito'. The base word 'primo' comes from Latin 'primus' meaning 'first', which originally referred to first cousins or close relatives. The diminutive suffix '-ito' adds a sense of smallness, endearment, or youth to the base word, thus creating 'primito' to mean 'little cousin' or as a more affectionate way to refer to a cousin.

Some related simpler Spanish words include 'primo' (cousin) and 'primero' (first). These words share the same Latin root 'primus'. While 'primo' retained the familial meaning to refer to cousins, 'primero' maintained the original numerical meaning of 'first'.

English words related to 'primito' through the Latin root 'primus' include 'prime', 'primary', and 'primitive'. All these words retain some connection to the idea of being 'first': 'prime' refers to being of first importance or quality, 'primary' means first or main, and 'primitive' refers to being first or earliest of its kind.