One of the biggest scenes in the Chicago Fire season 12 finale involves Kelly Severide

and Stella Kidd having a conversation about starting a family. The discussion is prompted

by a text from Sylvie, who is now based in Oregon, with a photo of Baby Julia.

Noticeably, her initials on the phone are “SC,” and below it shows that she now goes by Sylvie Casey. Taking her husband’s last name shouldn’t be surprising, since it’s the norm. However, this deviates from Firehouse 51’s tradition where the woman keeps her name after getting married to a fellow major One Chicago character. This is the case when Stella Kidd married Kelly Severide two years ago in the Chicago Fire season 10 finale. The same goes when Randy McHolland aka. Mouch tied the knot with Chicago PD’s Trudy Platt. Even when Matt married Gabby Dawson in the earlier years of the Chicago Fire, Monica Raymund’s character maintained her last name. It’s unclear if this trend is done consciously.

No official reasoning for this has been provided. Given this, there’s also no set rule regarding the matter. Still, it’s an interesting creative decision, considering Sylvie’s One Chicago predecessors. Why It’s Easier For Sylvie To Take Matt’s Last Name Than Other Chicago Fire Brides Sylvie Going By Her Married Name Is An Easier Transition. Sylvie Brett, Matt Casey, Kelly Severide, and Stella Kidd in Chicago Fire Sylvie changing her surname to Casey’s isn’t any indication that her relationship is better than other Chicago Fire marriages. However, she is in a unique position that makes this transition so much easier.

Moving to a different state means that she would start a new life, which includes meeting new people. Introducing herself by her marital name, Sylvie Casey, would be easier compared to someone like Trudy, who has always been known as Platt. Perhaps the other Chicago Fire brides did change their names legally, but they will always be called by their maiden names.