The Spanish word 'kurdo' meaning 'Kurdish' comes to us through French 'kurde', which in turn was borrowed from Arabic 'kurdī'. This term has maintained its meaning of referring to the Kurdish people and their culture throughout its journey across languages.

There aren't any notably simpler or more common Spanish words that share the same etymology as 'kurdo', as this is a relatively direct borrowing used specifically to refer to Kurdish people and things.

The English word 'Kurd' and its adjective form 'Kurdish' are cognates of Spanish 'kurdo', as they ultimately come from the same Arabic source 'kurdī'. While English borrowed the word through different routes, both Spanish and English use these terms to refer to the Kurdish people and their culture.