Names that sound significantly different in America vs Britain

Example: British friend said Cecilia was an ugly name and that’s when I realized the pronunciation is slightly different over there. Each syllable is more enunciated. But it makes the name have an entirely different energy.

Me: sih-seal-ya

Her: sess-ill-eee-ya

She also said my pronunciation of Cecil (SEE-suhl) is weird. But both of us are technically correct. She says it more like sess-ill