Hi CW: I like your advice, but not sure my wife will buy in.
Hi Rob: it’s an interesting subject for me also. I am unaware of much German language in my 4 families. The gravestones (Wisconsin) are all in Czech and I never heard that they spoke German. Curiously Czech speaking Bohemians in America seem to favor the German forms of their first names, eg Wenzel for Vaclav and Adalbert for Vojtech, for everyday use but their gravestones reverted to Czech. I’ve noticed that the German ship captains recorded German first names into the manifests and then the immigration cards are derived directly from these, misspellings and all (I don’t think most immigrants could write). So maybe they just kept using the German forms, or maybe Czechs in German speaking Austria just were used to one first name in their community then the German form with outsiders and the government, so kept using the same system here.
Czech speakers in this part of Bohemia went nearly all the way to the current German border.
Most 19th century Bohemian immigrants embarked from Bremen and arrived at either Baltimore or Galveston. I’m a temporary expert at finding the Baltimore ship manifests so pm me if you want help finding them in the archives. It’s remarkable to scan down a manifest of 275 people, half list origin Bohemia and half list various German states, and all the Bohemians list Wisconsin as their destination and all the Germans list Cincinnati.
If you’re doing genealogy research remember that Catholic baptism and marriage records use the Latin forms of first names even in the United States until very recently. You really need a chart with the Czech, German, Latin, and English forms of the same first name to have any hope of keeping people straight.
Last comment: I believe the countries that had the largest % of people emigrate are Ireland, Norway, Sweden, and Bohemia/Moravia in that order.