I do family research and the naming conventions in my German Hungarian family are responsible for so many clumps of hair torn out.
Brothers emigrating from 1890 to 1910, all to Philadelphia, all with the same unusual last name. Joseph, Frank, Peter, Adam, John. Two sisters, Dorothea and Magdalen.
Joseph married and had no children. Frank married and had Frank and John. Peter died unmarried during WW2. Adam (I) died as a baby. John married and had John, Adam, Peter, Joseph, Dorothea and Magdalen. Adam (II) married and had Peter.
Two of these brothers married sisters, who were their cousins. With the same roster of family names. And with four brothers. Frank, Joseph, Peter and Wendelin. And those brothers all married and had children. So their wives' families, also impossible German Hungarian names as last names, have the same seven first names.
62 first cousins. Born over 17 years. All with one of the above seven first names and one of two last names.
That was two years of my life spent untangling that.