Why does my computer name end in -2?

I was in Terminal running some commands and noticed that my computer name ended in -2. For example, Johns-MacBook-Pro-2.local , is this normal ?

and so?
I have the same problem with my new macbook pro with Lion on. Sometimes it starts up in safe_boot (red characters on top right) and there is no reason (correct shut down and so on).
I also have a wireless apple keybord and magic mouse and an external monitor connected.
I usually first turn the keyb and mouse on and connect the monitor and only then I start up the mac.
Is this the problem? What's the correct sequence not to have Safe_boot?
I think this should be a widely known issue because continuous safe boots on a new mac and system are not ... fair.
Thanks in advance for your reply.

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Launch the Console application in any of the following ways:
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☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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Some private information, such as your name, may appear in the log. Anonymize before posting.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
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2011-11-17-085303.panic
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panic(cpu 2 caller 0x00143764): "zalloc: \"kalloc.4096\" (311818 elements) retry fail 3"@/SourceCache/xnu/xnu-1228.15.4/osfmk/kern/zalloc.c:966
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0x7ef4f888 : 0x12b4c6 (0x45f91c 0x7ef4f8bc 0x13355c 0x0)
0x7ef4f8d8 : 0x143764 (0x4614d8 0x460150 0x4c20a 0x3)
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0x7ef4fa08 : 0x97e277b3 (0x1 0xd38 0x7ef4fa38 0x68d89e00)
0x7ef4fa28 : 0x97e23514 (0x68d89e14 0x0 0x0 0x0)
0x7ef4fa58 : 0x3bfc6b (0x3df2d054 0x2b9317f8 0x0 0x24f0a3)
0x7ef4fa98 : 0x3bfd28 (0x2b9317f8 0xaa02904 0x0 0x0)
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0x7ef4fe48 : 0x240be5 (0x7b19f300 0x0 0x1 0x549124)
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9L30
Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
System model name: MacPro1,1 (Mac-F4208DC8)
System uptime in nanoseconds: 145228120280331
vm objects:5850460
non-kernel map entri:1264428
kernel map entries:8462300
pv_list:1851864
kalloc.16:5443584
kalloc.32:81367040
kalloc.64:63418368
kalloc.128:2445312
kalloc.256:80748544
kalloc.4096:1277206528
kalloc.8192:2015232
vm pages:66613448
ipc ports:1197700
MAC Labels:1326168
vnodes:5018400
namecache:1644240
HFS node:6737024
HFS fork:2779840
buf.4096:2920448
buf.8192:56360960
Kernel Stacks:1785856
PageTables:29204480
Kalloc.Large:11616404
unloaded kexts:
com.apple.iokit.IOUSBMassStorageClass          2.0.8 - last unloaded 78388390721999
loaded kexts:
com.symantec.kext.fw          1.0.3f5
com.symantec.kext.confidentialData          1.3f44
com.symantec.kext.filesecurity          1.3.3f65
com.symantec.kext.SymAPComm          11.1.2f17
com.symantec.kext.pf          4.1.1f13
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com.symantec.kext.internetSecurity          1.3.2f5
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com.apple.driver.AppleUpstreamUserClient          2.7.5
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