Here are a few options for the WordPress post tag description, keeping in mind that brevity is often best:

**Option 1 (Most concise):**

> 解釋英文名稱的來源與典故。 (Explains the origins and historical significance of English names.)

**Option 2 (Slightly more detailed):**

> 探討英文名稱的起源、命名方式以及背後的故事。 (Explores the origins, naming conventions, and stories behind English names.)

**Option 3 (Focusing on education):**

> 學習英文名稱的歷史、文化背景及語言學知識。 (Learn about the history, cultural background, and linguistic knowledge of English names.)

**Option 4 (Focusing on interest):**

> 分享有趣的英文名稱由來，揭開背後的文化密碼。 (Share interesting origins of English names, unveiling the cultural code behind them.)

**Why these options work:**

* **They clearly relate to the tag title (“英文名稱由來”).**
* **They use concise, easy-to-understand language.**
* **They hint at the kind of content the tag will link to.**
* **They are suitable as WordPress tag descriptions.**

The best option will depend on the specific content of your blog and the tone you want to convey. If your posts are mostly educational, option 3 is appropriate. If you are going for a more casual tone, something like option 4 might be better.