How to stop iPhone from autocorrecting a specific word?

iPhones don't have a specific function to teach them how to recognize uncommon names through voice recognition.

• Add Phonetic Name: Edit your Sister Jean contact and add his name phonetically in a separate field. For example, type "Jean" (or whichever pronunciation you use) in the nickname field. This might help Siri recognize your intended contact.
• You can try re-training Siri by deleting both of Jean's contacts and adding them back. This might help Siri recognize your intended Jean more accurately.
• You can also assign relationships to your contacts in your iPhone's settings. For example, you can specify that one Jean is your Sister. You can do this by going to Contacts, selecting the Jene you want to assign a relationship to, tapping Edit, and then tapping add related name. This can help Siri prioritize the correct contact when you use terms like "my sister."
• See if you have a nickname set for your sister Jean's contact. Siri might be prioritizing the nickname over the full name.

Change iPhone Language (Optional): If none of the above work and you primarily use the phonetic spelling (Sean), you can consider changing your iPhone language to match. This might be a big change though, so only consider it if the other solutions don't work for you. Go to Settings > General > Language & Region and choose the language that best reflects how you pronounce Jean's name.