It's been six weeks since I sent off my name change request, and I've heard nothing. So I called them today to see what the holdup is.
Apparently they need copies of my drivers license and health care cards (PITA, but not a big deal), and my Certificate of Landing from when my family immigrated to Canada. Well, that was more than 50 years ago. I presume that my parents kept the certificate for a while, but they are long gone, so there is no way to track it down. I had sent them my Citizenship Certificate in lieu, but apparently that's not enough.
I'll send them what I have - a photocopy of the immigration stamp in my father's passport from when he cleared Canadian Immigration when our family landed here - and it had better be enough. It it's not, I'll be ROYALLY P!SSED, because that means I will forever be dead-named and misgendered in official documents.