How many Americans even know who Trudeau is?
it's a household word, dynastic like Kennedy. They may not know or care which trudeau you're talking about, but they know that trudeau is a brand name in canadian politics.
Most Americans don't know anything about Canadian politics. The average American probably thinks that all guns are banned in Canada. If I asked people I knew to name foreign leaders, they would name Vladimir Putin, Kim Jong-un, Benjamin Netanyahu, Queen Elizabeth II, Pope Francis, Angela Merkel, Bashar al-Assad, and maybe Enrique Peņa Nieto. Over the last decade names such as Kim Jong-il, Fidel Castro, Tony Blair, Muammar Gaddafi, Mahmoud Ahmadinejad, Nicholas Sarkozy, and Hugo Chavez would probably have made the list as well.