The spelling of the name "Heathir" is quite straightforward when broken down by its International Phonetic Alphabet (IPA) transcription. The initial "h" is pronounced with a voiceless glottal fricative, followed by the "ee" sound with a long vowel "i" and ending in the "thir" syllable with a voiceless dental fricative. Therefore, the spelling of "Heathir" represents the sounds within the name phonetically, allowing easy pronunciation for individuals who are familiar with the IPA system.