If a proper noun's last consonant would be harmonized when followed by a vowel, you pronounce it so. However in writing you don't write it like you say it. For example:
| I love Burak. | Burak'ı seviyorum. |
| We listen to Zeynep. | (Biz) Zeynep'i dinliyoruz. |
In these two examples, you would pronounce the suffixed nouns as Burağı and Zeynebi, respectively, but write them differently. Now look at these sentences:
| I love Meriç. | Meriç'i seviyorum. |
| We listen to Serhat. | (Biz) Serhat'ı dinliyoruz. |
In these examples, we have exceptional proper nouns. Just like the others, when you add a suffix to them you separate them with an apostrophe. However, when pronouncing these names, their last consonant is not harmonized (i.e voiced). You pronounce them as you write them: Meriçi ve Serhatı.
You will slowly learn which names are exceptional and which follow the rule with time, as you encounter them. No need to worry yourself about them.
