Individuals surnamed ROSENBAUM, ROSENBALM, ROSANBALM, ROSENBLOOM, ROSENBLUM, ROSENBOOM, and variations are welcome to join this Y-DNA surname project. Only males have a Y-chromosome, so only males can participate. For females to participate in a male Y-DNA project, you will need to find a male relative who is willing to be tested on behalf of your line — as long as your email address is included on his member account, you can share access to the account. To participate meaningfully, members will need to share at least the identity of the earliest known ancestor on their patrilineal (direct male) line. Members will need to sign the Release that comes with their kit allowing matching and sharing. Members will also need to set the sharing of their results (not their identity) to "Anyone" on the "Privacy & Sharing" tab of their member page. Otherwise, their test results will not appear on the Project Results page here at the FamilyTreeDNA web site. If you don't share results and earliest ancestor information, your test results won't be of use to genealogical researchers.