StCyr

I wouldn't. No one will ever be able able to pronounce it.

Have you considered StDhurst for a boy? It's pronounced Sandhurst.

It's only like St.John/Sinjun, though, isn't it? I assumed Sincere, because of that.

Its a nice name but I really struggled trying to work out what the name was when I saw the thread title. They would have to spell their name out every time which would put me off I'm afraid.

To me first glace it looks like Stacy gone hideously wrong

How about Sincerity instead? Sort of sounds like Verity, Felicity, etc.

They'll call her Sin for short though. Are you religious?

I would have pronounced it St (saint) Seer.
If you told me it’s a French derivation, then I’d want to say ‘San’ for St.

There’s plenty of virtue names that work better for the U.K. - Mercy, Grace, Prudence, Honour, Liberty...

It's a no from me.

A) i can imagine it would be a massive pain the arse to constantly explain / correct the pronunciation of your name, and
B) sincere (imho) isn’t a very nice name to have. (what if she isn’t?)

It's also a absolute no from me, no one will be able to pronounce it or understand the name at all. If you were in the country that uses the names like that it would make so much more sense but your child will have a lifetime of having to explain/spell their name.

No, please dont.

Also st cyr in french is "san seer" (obviously depending on regional accent) if written phonetically in English. In English it's pronounced "sin seer" phonetically.

Therefore to ask people to call her sincere isn't correct either and is illogical so you'll be constantly correcting people as nobody, whether or french or English will be able to say her name without prompt.

It's pronounced SanSear, and I think you could make it quite hard for your DC to have it said differently (lifetime of explaining it's not that)

In case you didn't know, it's the name of the French military college, to to people familiar with the Forces it's like calling your DC Sandhurst or West Point.

I would say no. You would be setting her up for a lifetime if having to spell her name and correct people etc. It's not really fair I don't think.

I think it sounds like a mispelled/mispronounced wine.
I think Sincerity is quite nice if I think about it.

how about:
StOptic
StYkle
StKopation

No

She won’t thank you for it when she’s older.

I think it’s a cool idea, but only as a middle name.

I thought it would be pronounced "Sticker". Big fat no from me, sorry!

I think it's a lovely name, but pronounce it San-sear.

I thought there was a typo in the thread title

And even when confirmed by OP in the thread that it's the correct spelling, I wouldn't be sure how to pronounce it and would likely go French in a way that's not how OP has intended. No one needs this level of complexity (I have it, I hate it).

St Cyr doesn't mean Victory. It's the name of the elite military academy of France. The motto is "ils s'instruisent pour vaincre" meaning something like "they learn to overcome".

I think I would hate to have that as a name - no-one will know how to say it when they see it written down and no-one will know how to write it down when they hear it said.
I work in a City with a massive number of dc from all round the world, and you do get used to names from all sorts of cultures, but I think that is tricky even for me.

how about the name Serenity op? similar feel to your initial idea but without the spelling/pronounciation nightmare?