Such terms as these are proper names.

这些名词是专有名词。

Time to start giving extrasolar planets proper names

该替太阳系之外的行星适当取名了

Researching proper names is still continuing now.

历史上关于专名的研究一直持续到现在。

If it's a formal letter you may want to use proper names like "Dear Ms. Smith".

如果是一封正式的感谢信，你可以以“亲爱的史密斯女士”这样一个比较恰当的称呼开头。

The branch of lexicology that studies the origins and history of proper names.

词汇学中研究专有名词起源与历史的分支。