The Spanish word 'tata', meaning 'father' or 'daddy', comes directly from the Latin word 'tata' which had the same meaning. This is an example of a nursery word or baby talk term that has remained remarkably stable over time, maintaining both its form and meaning from Latin to modern Spanish. Such stability is common in words that children use to address their parents, as these tend to be among the first words babies learn and often consist of simple, repeated syllables.

'Tata' is already one of the simplest forms of address for 'father' in Spanish, being a basic repetition of the syllable 'ta'. It's often used as an affectionate or informal term, similar to how 'papá' is used.

While English doesn't use 'tata' for father, it's interesting to note that many languages across the world use similar-sounding words for 'father' or 'daddy', like 'dada' in English. This is because babies typically find it easier to produce simple, repeated syllables like 'ta-ta' or 'da-da' as their first words. In English, 'ta-ta' exists but has evolved to become a childish way of saying 'goodbye' instead.