合併格最後姓名 取出 (10001)

D2{=IFERROR(OFFSET(B$1,SMALL(IF(ROW($1:$99)<COUNTA(A:A),LOOKUP(ROW($1:$99),SUBTOTAL(3,OFFSET(A$2,,{0,1},ROW($1:$99))))),ROW(A1)),),"")

另解{=INDEX(B:B,SMALL(IF((A$2:A$25="")*(A$3:A$26>"")+(B$3:B$26=""),ROW($2:$25),99),ROW(A1)))&""