Here are several places named Bonnycastle. If you come across one to add, please let me know.
- Mount Bonnycastle, British Columbia. Named for William Robinson Bonnycastle (1874-1951), a hydrological engineer. He was a Louisville Bonnycastle who emigrated to Canada
- Bonnycastle Island. Named for the above's son William Robinson Bonnycastle (1922-1996), for his service to Saskatchewan and Canada
- Bonnycastle Court, Winnipeg. A street presumably named for Richard Henry Gardyne Bonnycastle
- Bonnycastle Street, Toronto. Richard Henry Bonnycastle lived here in the 1830s.
- Bonnycastle Lunch & Tea Room. Fort Henry was built between 1832 & 1837 to protect the Lake Ontario end of the Rideau Canal and Richard Henry Bonnycastle was instrumental in completing it. The Fort is now a National Historic Site and the Tea Room is named in honour of Sir Richard.
- Bonnycastle Lane, Rothesay, New Brunswick. Charles Humphrey Bonnycastle was a headmaster of Rothesay Collegiate School
- Bonnycastle Crescent, St John's, Newfoundland. Richard Henry Bonnycastle commanded the Royal Engineers in Newfoundland in the early 1840s
- Bonnycastle Drive & Lane, Yukon, Oklahoma. We don't know why these streets were named Bonnycastle.
- Bonnycastle Avenue, Frankfort, Kentucky. Anyone know the origin of this one?
- Bonnycastle Avenue, Louisville, Kentucky. Charles' widow Ann and children moved to Louisville from Charlottesville after his death in 1840. The Bonnycastle name can be found on streets, neighborhoods, businesses, and clubs in the area.
- Bonnycastle Avenue, Englewood, Ohio. Anyone know the origin of this one?
- Bonnycastle Street, Charlottesville, Virginia. Charles Bonnycastle was an original faculty member at the University of Virginia.
- Bonnycastle Alley, Ashburn, Virginia. Presumably after Charles noted above.
An 1878 map of Seymour Township, Northumberland County, Ontario, showing the lands held by the Bonnycastle and Rowed families.