Frankestein was written by Mary Shelly more than one century ago, the same as with Dracula by Brian Stocker based on Drakul from Romenia, much older yet. You can use those names freely, as many old personages and there are a lot of them. A very simple rule, if the personage is older than a century you can use it, if is less you must research if you can or cannot.

Stupidity also evolves!