There are a handful of neighborhood and street names used in Toronto (not necessarily from Toronto) that have unusual pronunciations. Here I'll give some triples of (English spelling, actual pronunciation (IPA), a naive pronunciation (IPA)):
(Yonge, [jʌŋ], [jɑndʒ]); (Strachan, [sdʒɹɑn], [ˈsdʒɹa.tʃæn]); (Tecumseth, [tə.ˈkʌm.zi], [ˈti.kəm.sɛθ]); (Markham, [ˈmɑr.kʌm], [ˈmɑrk.hæm]), (Etobicoke, [ɛ.ˈtoʊ.bɪ.koʊ], [ɛ.ˈtoʊ.bɪ.koʊk]).
See also: https://www.youtube.com/watch?v=i2cyg6bFeRc , https://www.youtube.com/watch?v=1PmeDWvwD8M
That's because some are Indigenous names phoneticized for English speakers (Yonge and Markham on the other hand are entirely English names):
Etobicoke. From Adobigok [1]
Tecumseh (or Tecumseth). From tecumtha or takhamehse [2]
Mississauga. From Misi-zaagiing [3]
[1] https://www.etobicokehistorical.com/brief-history-of-etobico...
[2] https://en.wikipedia.org/wiki/Tecumseh
[3] https://en.wikipedia.org/wiki/Mississauga