For things like that, are they differentiating the usage of it as a _word_ vs a name? That seems possible. The name "Einstein" has existed forever I'm sure, bu

For things like that, are they differentiating the usage of it as a _word_ vs a name? That seems possible. The name "Einstein" has existed forever I'm sure, but its current use in language didn't really pick up until, what 1930s/40s or later?