@EdwinG Sadly, contrary to the Commission de toponymie in Quebec, Ontario’s GeoNames database doesn’t go down to street names. You’d have to contact the City of Ottawa, since it’s one of its committees that decides on street names and likely keeps archives about what they’re named after.

https://www.ontario.ca/document/ontario-government-terminology/geonames-ontario

@EdwinG Thsi does not contain your answer on Tremblay Rd, but could give you pointers

https://www.historicplaces.ca/en/rep-reg/place-lieu.aspx?id=15815

Image is from 1958 prior to construction of the "union" train station. The 417 was still being built. (You can see the exchange at 417/St-Laurant beilng built on right. And Tremblay had its onw bridge across the river to connect to Hurdman St. (in pioc 2, you can see the newly built but not yet open 417 bridge. Street predates train station by long time.
https://experience.arcgis.com/experience/a089091f3c6e47a69fa8227e80698b2a/page/Page/?views=City-Of-Ottawa

@EdwinG The city of Ottawa likely has an archives serction which may know when Tremblay Rd was created and how name was chosen.

https://ottawa.ca/en/3-1-1/services-phone-e-mail-and-person/general-inquiries

However, not sure this area was part of the city of Ottawa when that road was created.

BTW, in the 1980s, the station was more refered to being *at* Alta Vista (now Vanier Parkway to north and Riverside to south of 417). Alta Vista now just a disconnected stub that no longer reached the 417 interchange. Pic from 1976