The word "Santillan" is a common surname of Spanish origin. It is spelled with two "l" letters, which are pronounced as the voiced alveolar lateral approximant /l/ in the International Phonetic Alphabet (IPA). The first syllable is pronounced with the vowel sound /æ/, like the "a" in "cat", while the second syllable has the vowel sound /i/, as in "beet". The stress is on the second-to-last syllable, making it san-TIL-lan. The correct spelling and pronunciation of names is important for accurate communication and respect for different cultures.