There are a few different varieties of Hoya griffithii and the variant Silver has lots of silver flecks on the leaves, which I assume is where it gets name.
![](https://i0.wp.com/vermonthoyas.com/vhwp/wp-content/uploads/2023/01/Hoya-griffithii-Silver-01042023f.jpg?resize=625%2C833&ssl=1)
There are a few different varieties of Hoya griffithii and the variant Silver has lots of silver flecks on the leaves, which I assume is where it gets name.