The word "Gastel" is an uncommon surname that is often spelled incorrectly due to its unique phonetics. In IPA phonetic transcription, it is spelled as /ˈɡæstəl/, consisting of five letters and two syllables. The "a" is pronounced as a short "a" sound, while the "e" is silent. The "t" in the first syllable is pronounced with a slight emphasis, and the "l" is silent. Overall, the spelling of "Gastel" can be tricky, but once its phonetics are understood, it becomes easier to pronounce and spell it correctly.