I always found this fact about the common Spanish surname Rodríguez to be interesting:

>The "ez" signifies "son of". The name Rodrigo is the Spanish form of the German name Roderich, meaning "rich in fame", from the Gothic elements "hrod" (fame or glory) and "ric" (rich). It was the name of Roderic, the last Visigothic King before the Muslim conquest, and the subject of many legends. The surname Rodríguez could have originated in the 9th century when patronymic names originated.

https://en.wikipedia.org/wiki/Rodr%C3%ADguez_(surname)

The Visigoths directly ruled in Iberia so that's an example of the "elite influence" spreading culture and language.