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The tradition was because of the evolution of different catholic orders in spain taking on what they considered holy names, iirc. It wasn't a taboo in Spain (and by convergent evolution, it *technically* isn't a taboo in the anglosphere either, because of the name Joshua which is an anglicization of the Hebrew name of Jesus (Yeshua) vice the Hellenized name that Jesus comes from). It arose in the 1600s, it wasn't used before then. This is also the same reason that so many Spaniards and Hispanics are named after the saints or Mary at a disproportionately higher rate than other catholic countries, with names (Apellidos) like "de Santa Maria" or "San Francisco". Conversely, puritanism and British israelism are why there are so many old testament names in the anglosphere (again, at a disproportionately higher rate than other protestant countries). Eventually it came to taking the name of Jesus for the Spanish, and it became a first name because if a Spaniard did not want to or could not change their Apellido to "Jesús", they gave their child the first name. The same thing happened with the names of the saints. Purely Latin (as in pre catholic roman) based names in the hispanosphere are pretty rare because of this, whereas in Italy they're still very common. The example I gave of the anglosphere is also why there aren't many germanic given names in anglosphere countries.

That being said, it was a taboo in most other catholic countries, just not in Spain. There's no actual scripture that says it *is* a bad thing to do, however, so I don't personally see a fault in it, but I can also see why someone would think that it is. The anglosphere and the hispanosphere both evolved (at almost the exact same time no less) to take on "holy" names, probably being as Spain was the "most zealous catholic" catholic country and England was the "most zealous protestant" protestant country, leaving a lot of other names by the wayside in the process and adopting respective cultures around naming conventions that were different from their cultural contemporaries.

For proof of this: look up spanish names vs italian names and see how many more pre catholic Latin names Italy has. Look up English or american names vs German names for the same thing, there are actually *very few* biblical german names, but they absolutely dominate English names.