A single famous person was born in Sandy Hill: Rennison Manners

The top name is Rennison Manners (Canadian ice hockey player), going by Wikipedia coverage.

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

Of the 1 on the list, 1 are athletes. That is 100% of the town’s list, against 38% across Canadian towns.

Two sources must agree: Wikidata, placing the birth inside Sandy Hill’s neighbourhood outline (the census tracts it is drawn from) or one of its hospitals or districts, and the person’s English or French Wikipedia article. Moving here later is not enough, and adult performers and people known chiefly for crimes are not listed. Toronto, Montréal, Ottawa and the other split cities keep a birth recorded only as the city on the city’s own page, while each neighbourhood lists just the births recorded in it.

Wikidata may give their birthplace only as Canada or a province, as a rural area or hamlet without a page here, or as another town; or their article may name a different place, or none. Only people both sources agree on are listed, and a fix on Wikidata or Wikipedia shows up here at the next refresh.