Mischna zu Wajikra 15:29

What is meant by one "name"? For a birth and a birth, or for zivah and zivah, that is one name. And "two names"? For a birth, [and the other] for a zivah. What is meant by "two women"? [When] one [woman] brings [her offering] for a birth and the other for a birth, or [when one brings] for a zivah and the other for a zivah this is "of one name". And a case "of two names"? When one brings for a birth and the other for a zivah. Rabbi Yose says: when two women purchased their kinnim in partnership, or gave the price of their kinnim to the priest [for him to purchase them], then the priest can offer whichever one he wants as a hatat or as an olah, whether they are of one name or of two names.