54 themes contain duplicate names. 628 duplicates total, 13 duplicate duplicates.
True, but I'm not sure we want to change this. For example,
Athabasca is a native tribe, a river, a national park, and a lake (all in Canada). That's five different naming themes it could all reasonably be on, and I don't think there is a correct answer as to which one gets to keep it. (Sure, three of those entries could become
Lake Athabasca and
Athabasca River and
Athabasca Park but if I wanted all my River class vessels to be called '[something] River' I'd use the new naming conventions to do so.)
Likewise, as mentioned above Sir Isaac Newton is both a famous astronomer and a famous person. Which list gets to keep him?
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I was one of the people responsible for getting Aurora auto-name generation changed to ignore skipped names instead of retrying them, precisely
because of name duplication issues -- because Collingwood is both a famous admiral and an Australian city. Because
Le Havre appeared on two lists back then and I didn't want to manually rename twenty-two battlecruisers.
I want to keep duplicated names. . . though I would be delighted with a tool to quickly check if my empire has duplicate names.