"Collby" is not a correctly spelled word in English. However, if we break it down phonetically using IPA transcription, we might assume that it is intended to be pronounced as /kɒl.bi/. This would suggest that the spelling might actually be "Colby". In this case, the "o" would make the "k" sound like /kɒl/ and the "by" would be pronounced as /bi/. Correct spelling is important for clear communication and understanding, especially in written forms of language.