One famous person was born in Dalhousie

By our measure the best known is André Roy (Canadian actor, playwright and comedian); the spotlight above gives the details.

For Dalhousie the list comes to 1, every birthplace backed by an English or French Wikipedia article.

Mostly performers: 1 of the 1 people listed. 100% here, set against 10% for Canadian towns.

What counts is a birth that Wikidata places inside Dalhousie’s municipal boundary (Statistics Canada’s 2021 census subdivision), its hospitals and districts too, and that the person’s English or French Wikipedia article repeats. Adult performers, people known chiefly for crimes and those who only lived here are not on the list. Dalhousie is also the name of another municipality in New Brunswick: for everyone listed here, Wikipedia gives only “Dalhousie”, so the other place can’t be ruled out.

The likeliest reasons: a birthplace recorded only as a province or as Canada, a hamlet or rural area with no page of its own, or an article that gives another place or none. Fixing Wikidata or Wikipedia brings them onto the list at the next refresh, as long as the two then agree.