2 sentences for 字 (zì — courtesy name)

1. 李白，字太白。

   Lǐ Bái, zì Tài​bái.

   Li Bai's courtesy name was Taibai.

   Source: Dong Chinese Dictionary

2. 孔子名丘，字仲尼，因其在兄弟中排行第二。

   Kǒng​zǐ míng Qiū, zì zhòng ní, yīn qí zài xiōng​dì zhōng pái​háng dì'èr.

   Confucius was named Qiu, and his courtesy name was Zhongni, because he was the second oldest among his brothers.

   Source: Dong Chinese Dictionary