The spelling of the word "Turfen" may seem confusing to some, but it follows the rules of English phonetics. Using IPA (International Phonetic Alphabet), "Turfen" is transcribed as /tɜrfən/. The "ur" sound is represented by the IPA symbol /ɜ/, as it is pronounced similarly to the "ir" in "bird." The final "en" sound is spelled as "en" to indicate the pronunciation of the schwa sound /ə/. So, the spelling of "Turfen" accurately represents its pronunciation in English.
Made of turf; covered with turf.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.