Every year since 1917, one name has topped the Ontario register for each sex. Here is the whole line of succession — and how much smaller the crown has become.
Reign length runs left to right. Height is the name's peak share of all births — so a tall reign ruled a crowded nursery, a flat one merely led a scattered field.
Source: Office of the Registrar General, Ontario, Baby Names (male and female), 1917–2024, via the Ontario Data Catalogue under the Open Government Licence – Ontario. Each year's leading name and its share are taken from the published annual counts; a name that reclaims the crown after losing it appears as a separate reign. Part of the Make It Make Toonies register.