'confianza' originates from Latin, specifically the word 'confidentia', where 'con-' meant 'with' and 'fidere' meant 'to trust.'

'confianza' changed from Late Latin 'confidentia' and was influenced by Old French 'confiance' and Old Spanish forms such as 'confidansa' before becoming the modern Spanish 'confianza'.

Initially it meant 'a state of trusting' (faith/trust), but over time it broadened to include 'self-confidence', 'familiarity', and also senses of 'presumptuous boldness'.