No, it's not a matter of names; the Austrian school (not to be confused with economists from Austria) claims they don't actually exist, and that the examples usually given can be explained by governmental manipulation.

"There is no evidence of the "natural-monopoly" story ever having been carried out — of one producer achieving lower long-run average total costs than everyone else in the industry and thereby establishing a permanent monopoly."

https://mises.org/library/myth-natural-monopoly