The spelling of the word "Wellby" is quite straightforward if one uses the International Phonetic Alphabet (IPA) phonetic transcription. The first syllable "Well" is pronounced /wɛl/, with the "w" sound being the same as the beginning "wh" sound in "why." The second syllable "by" is pronounced /baɪ/, with the "aɪ" representing the diphthong sound typically found in the word "buy." So, "Wellby" is pronounced as /wɛlbaɪ/.