create the same workgroup

Do I need to create the same workgroup name for my network

No, not really. You can have multiple workgroups in your network. However, it's better to create the same workgroup name on all computers. That will make it easier and save time to find other computers, especially in the first 15 minutes after logon.
Workgroup common Issue 1 - doesn't work after adding W2K/XP
SYMPTOMS: When setting up a Peer-to-Peer Workgroup, you may have difficulty to network all computers that are running W2K, XP, Win9x, ME and NT. The issues may include the inability to connect to a shared folder or a shared printer, the inability to browse by using Network Neighborhood in Windows 95 or Windows 98, or the inability to browse by using My Network Places in Windows 2000. Some people may find that, before W2K/XP were installed, the computers may have communicated effectively with the other workgroup computers.
RESOLUTIONS: To resolve these issues, configure all computers to have a common networking protocol, a common workgroup, and common user names and passwords
Workgroup common Issue 2 - problem in a mixed OS
Symptoms: 1) win9x computers can see each others but not W2K or XP. 2) win9x and W2K/XP can ping each other by using IP but not computer names. 3) Net view \\computername shows error 53.
Resolutions: this is a name resolution issue. Since this is a workgroup without WINS server, you may need to enable NetBIOS over TCP/IP on W2K/XP. Note: some people find that installing NetBEUI or IPX also work. But loading NetBEUI or IPX is not recommended. If enabling NetBIOS over TCP/IP doesn't work while loading NetBEUI works, this is not name resolution issue. This may cause because of a software like firewall is running.
How to setup bridging network connection
If your computer with two NICs resides between two different IP subnets or two segment networks such as Ethernet network and HomePNA network, you can bridge the tow networks so that it can communicate with each segment. But you can't bridge an Ethernet connection with a VPN or dial-up connection. Also, don't bridge a private network with a connection that has a public Internet.
To bridge two networks, under Network Connections, select two connections (use Shift+Ctrl) you want to bridge, right-click or click Advanced>Bridge Connection. You can have only one network bridge , but the bridge can support multiple connections. You can easily add or remove connections from ntwork bridge by right-clicking the connection and choosing Remove From Bridge or Add To Bridge

Information From
http://www.howtonetworking.com/workgroupsetup.htm