Begin with the published transcription 迪亚斯, Dí yà sī. Its first character, 迪, Dí, is independently recorded as a Chinese surname, so you can keep it when building a shorter Chinese name. 狄, Dí, changes the character while keeping the same Mandarin sound; 邸, Dǐ, keeps the syllable but changes its tone. My starting recommendation is 迪 because its connection to Díaz is the easiest to show.
Compare the characters in your intended full name. 迪 retains the existing transcription; 狄 changes only the writing; 邸 changes the tone too. Those are the differences that should guide the choice.
Start with your family's pronunciation
For a Spanish-language reference, Díaz may be represented broadly as /ˈdi.as/ with seseo or /ˈdi.aθ/ with the distinction between s and z. The written accent marks the stressed i. These are comparison models based on Spanish spelling and regional pronunciation, not a rule that all Americans named Diaz must say their name alike. A family may preserve a Spanish pronunciation or use an established English-language pronunciation of its own. Ask how you actually introduce yourself before choosing from sound. 1, 1.1
The Chinese Ministry of Foreign Affairs uses 苏萨娜·迪亚斯 for Susana Díaz in a 2018 report. This directly supports 迪亚斯 as a published rendering of the Spanish surname. It does not establish a universal official Chinese spelling for every US Diaz family, and the example person's identity does not describe yours. 2
Using the complete 迪亚斯 preserves more of the surname's outline. Selecting just 迪 removes 亚斯 and no longer carries the final consonant or the rest of the vowel sequence. Mandarin Dí also has a rising second tone; the acute mark in pinyin is a tone mark, not the Spanish stress mark in Díaz. Pinyin d is not simply the English or Spanish voiced d. Treat the similarity as an adaptation, not an exact match.
Why 迪 is a viable surname
Academia Sinica's character database lists 迪 with di2, or Dí, and explicitly includes surname use. This is separate evidence from its appearance in foreign transcriptions. The entry also records senses connected with guiding, progressing and following. 3
Its strongest advantage here is continuity: “I took 迪 from 迪亚斯.” If you also like an association with guidance or progress, that can be your own reason for liking the Chinese character. It does not mean that Díaz originally meant “progress,” nor that Chinese families named 迪 have a particular personality.
The entry does not establish a contemporary frequency or guarantee immediate recognition. You can introduce it by showing the character and saying 我姓迪, Wǒ xìng Dí, “My surname is Dí.” Choosing a surname is easier when you are comfortable both saying it and explaining which character you use.
狄 changes the writing, not the sound
The Ministry of Education dictionary records 狄, Dí, as a surname. It has exactly the same Mandarin syllable and second tone as 迪. Consequently, it does not improve the phonetic match with Díaz: the difference is visual and associational. 4
It is reasonable if you simply prefer 狄 and accept losing the exact first character of 迪亚斯. The dictionary also records the character's historical use for peoples to China's north. That historical vocabulary is not an ethnic identity you acquire by choosing the surname. There is also no reason to borrow the biography of a famous bearer as if it described your family.
When you tell someone your name aloud, 迪 and 狄 will need a written explanation to distinguish them. That is a practical consideration, not a defect unique to either surname; characters that share a pronunciation occur throughout Chinese naming.
邸 adds a tone change
邸, Dǐ, is likewise documented as a surname. It keeps the di syllable but uses the third tone instead of the second. Historical meanings include residences and lodging places. Those meanings can help you remember the character, but they do not make it an aristocratic version of Díaz or confer social standing. 5
The third tone is not simply “lower stress.” Mandarin tone distinguishes words and names, and its realization changes in connected speech. If you compare Dí and Dǐ, listen in your intended full name, not only as isolated syllables. 邸 makes sense if you prefer the character and the full-name sound; it is a larger departure from the existing transcription than 迪.
Why I would not translate Díaz as “teacher”
The surname dictionary reproduced by Ancestry identifies Díaz as a patronymic related to the medieval name Didacus and refers to Diego. Its Diego entry leaves the remote origin uncertain, including competing explanations. That is enough to resist a confident shortcut from Díaz to “teacher,” “teaching,” or a Chinese surname selected on that basis. 6, 6.1
The documented sound route gives a clearer basis for choosing here. If learning is a personal theme you want in the name, treat it as your own preference rather than a verified translation of Díaz.
Try the complete name, then decide
As a neutral exercise, place each surname before 安, Ān: 迪安, Dí Ān; 狄安, Dí Ān; 邸安, Dǐ Ān. The first two sound identical in Mandarin; the third changes the initial tone. These are test combinations, not personalized full names or translations of your given name.
Choose 迪 when retaining the published transcription matters most. Choose 狄 for the same Mandarin sound with different writing. Consider 邸 if its character and third-tone combination suit your preference. Keep 迪亚斯 when you need the complete foreign-surname transcription. For someone starting afresh, I would test 迪 with the intended given name first.
What the US number counts
The recorded US source records DIAZ at rank 52, with a published frequency of 356,910 in the 2020 Census surname tabulation, released April 14, 2026. The count has undergone disclosure-avoidance processing; it is not a current 2026 resident count. The statistical key remains DIAZ, while Díaz is the accented editorial display here. The figures do not establish anyone's ancestry or personal pronunciation. Spain's separate first-surname total uses a different date and unit and must not be added to this count. 7, 7.1
Research and methodology notes
Sources used in this comparison: rae.es; Academia Sinica; MOE; MOE; DAFN. Read each source within the limits of the passage where it is cited. A documented transcription, surname use and surname pronunciation are separate questions.
The comparison is framed by “Start with your family's pronunciation” and “狄 changes the writing, not the sound”. Sound resemblance, word meaning and a cultural association are different reasons for choosing a name; only the routes argued in this article are proposed, without inferring personal ancestry.
Statistical scope: 2020 US Census published surname frequencies, released in 2026; not current residents.
