ɐ spˈɛlɪŋ wɪð ɐn ɪnˈɪʃəl "ˈaɪ" lˈeɪɾɚ bɪkˌeɪm dˈɑːmɪnənt, pˈɑːsᵻbli bɪkˈʌz əvɚ ɹᵻzˈɛmbləns tə ðə lˈætɪn wˈɜːd ɪɡniz "fˈaɪɚ".
A spelling with an initial "I" later became dominant, possibly because of a resemblance to the Latin word ignis "fire".