The Spanish word 'pobrecita' comes from the Latin word 'pauper' meaning 'poor'. The Latin word evolved into Spanish 'pobre', keeping the same meaning. To form 'pobrecita', two suffixes were added: first, the diminutive suffix '-cito' was added to 'pobre' to create 'pobrecito' (meaning 'poor little one'), and then the feminine suffix '-a' was added to make it specifically refer to a female subject.

In Spanish, 'pobrecita' is often used as a term of sympathy or endearment, literally meaning 'poor little thing (feminine)' or 'poor dear'. The diminutive suffix adds a sense of tenderness or compassion to the basic meaning of 'poor'.

The most basic related Spanish word is 'pobre', meaning 'poor' or 'unfortunate'. This is a very common word that you'll encounter frequently. Other related forms include the masculine 'pobrecito', which is used exactly like 'pobrecita' but for male subjects or neutral objects. You might also encounter 'pobreza' (poverty) or 'empobrecer' (to become poor), all stemming from the same root.

The English words 'pauper' and 'poverty' are cousins of 'pobrecita', all coming from the Latin 'pauper'. While 'pauper' in English specifically refers to a very poor person (especially one supported by public charity), and 'poverty' refers to the state of being very poor, the Spanish 'pobrecita' has evolved to be more of a term of endearment expressing sympathy rather than literally referring to economic status.