Since Micha is an OT name,
in reply to a message by JHK
perhaps its use is more typical among Jewish people, whereas among the rest of population is more common Micha as nickname for Michael (and that is just a guess).
The German version of Wikipedia lists people with Micha as full name and as nickname:
http://de.wikipedia.org/wiki/Micha
Lumia
http://onomastica.mailcatala.com
The German version of Wikipedia lists people with Micha as full name and as nickname:
http://de.wikipedia.org/wiki/Micha
Lumia
http://onomastica.mailcatala.com
Replies
Yes, that's possible.