"Beagen," a relatively uncommon word, is spelled phonetically as /biːgən/. The first syllable is pronounced as "bee" with a long "e" sound, while the second syllable is pronounced with a schwa vowel sound. The spelling of the word can be explained by breaking it down into its two syllables, with the first syllable being "be" and the second syllable being "gen." The spelling follows standard English phonetic rules and reflects the pronunciation accurately.