Poitain was a bit of a weird one for me, I think I started out with a literal pronunciation "poy-tayn", but I've taken to "pwah-tyne" or "pwah-tahn" recently. I'm still not sure really.
You're probably right-- now I'll have to stop saying (or thinking) Poytane too!
Pwatane, Pwatane, Pwatane. So is it PWA-tane, or pwa-TANE?
You can tell I am from Arkansas. At least I'm not as bad as my comic shop guy-- he calls D'Arnot in the Tarzan stories DARN-not instead of D'arno.... but when he says BEE-lit for Belit, I cringe. Roy always taught us it was Bay-LEET!
BTW, I saw the excellent Michael Cacoyannis Iphegenia in Greek, with English subtitles, and her name is pronounced, not Iffa-geNIa, but rather, Iffy-HENia. Poor, sweet little Iffy-HENia, such a cute little actress.