XPath - get element depending on its sub-element

I'm new to XPath, and using it in Java to fetch some data from website. Maybe you could help me or advice me what to use to accomplish what I want.

<a title="Person" href="some link">
 <name>John</name>
</a>
<a title="Person" href "some OTHER link">
 <name>Wayne</name>
</a>

How to get some attribute value of element depending on its sub-element?

For example, I need href value of element that has sub-element with value John, how to do that?

Thanks