Alonso
In short
Alonso is a Spanish surname and given name derived from the Germanic name Adalfuns. It is a Castilian variation of the name Alfonso.
In plain words
The name comes from old Germanic words meaning 'noble and ready'. Over hundreds of years, the 'f' sound in Alfonso changed into a silent 'h' in certain parts of Spain, creating the version we call Alonso today.
A simple example
A person named Juan Alonso carries a name that shares the same roots as someone named Juan Alfonso.
Why it matters
It shows how languages change over time through phonetic shifts. It also explains why two very similar names exist side by side in Spanish-speaking cultures.
Easy to mix up
It is often confused with Alfonso, which is the original form of the name before the sound changed.