Here are some possible suffixes you might be thinking of:
* -ean: This suffix is commonly used to form adjectives related to a specific place, people, or culture. For example: "American", "Canadian", "Mediterranean".
* -ian: This suffix is also used to form adjectives, often with a similar meaning to "-ean", but sometimes referring to something associated with a specific person, subject, or discipline. For example: "Arian", "Victorian", "avian".
* -ian: This suffix can also indicate belonging to a specific group or field, particularly in the context of sciences. For example: "bacterian", "mathematician", "oceanian".
If you can provide more context, like the word you're trying to use this suffix with, I might be able to give you a more accurate answer.