Unless this is a trick question, I'd say 'Krebs' so as to rhyme with Jeb's or Deb's. 'Goliath' is said in American English as shown in your first 'phonetic transcription' (where 'lai' rhymes with "lie" or "rye" or "my"). The second sounds to me like a (possibly) British pronunciation, but you'll have to wait for that answer.
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