The Spanish pronoun 'me' comes from Latin 'me' (meaning 'me' in accusative/ablative cases) and 'mihi' (meaning 'to/for me' in dative case). The Latin 'mihi' evolved into Vulgar Latin 'mi' before contributing to the modern Spanish form. Both forms descended from the Latin nominative pronoun 'ego' meaning 'I'. In modern Spanish, 'me' serves as the object pronoun form, covering both direct and indirect object uses.

The Spanish pronoun 'mí' (meaning 'me' when used after prepositions) is closely related, also deriving from the same Latin roots. Similarly, the Spanish possessive adjective 'mi' (meaning 'my') shares this common ancestry, showing how personal pronouns and possessives often develop from the same source.

The English pronoun 'me' is actually cognate with Spanish 'me', as both descend from Proto-Indo-European roots. While they developed through different branches (English through Germanic and Spanish through Latin), they maintained remarkably similar forms and functions. This is also true for English 'I', which is related to Latin 'ego' (though it underwent more dramatic sound changes).