Pronunciation of Mark Zuckerberg's name

I’ve noticed that the presenters on the BBC World Service pronounce the “Zuckerberg” with a ʊ sound as in ‘cook’ while the Americans pronounce it with an ʌ as in ‘cutter’. I find that very interesting and wonder what the reason might be. Maybe it’s because if you pronounce ‘Zuckerberg’ with an ʌ sound, it sounds similar to ‘sucker’?

TOEIC listening, question-response: Who is available to help unload this shipment?

Probably there is a small voice at the back of the brain linking ‘Zucker’ with ‘sugar’.

Yes, this makes sense.[YSaerTTEW443543]

TOEIC listening, question-response: How come I wasn’t told about the plan?[YSaerTTEW443543]