Ukki is hosted by Wikia.com, for free. Wikia will create a free MediaWiki wiki on request if they see it as having enough potential. You can find their website, and suggest an idea for a new wiki at Wikia.com.
Keep in mind that personal wikis and wikis for small groups that probably won't attract many editors will usually, if not always, be rejected. If your wiki plan does get accepted, you might want to read the configuration guide for MediaWiki admins for some tips on configuring the wiki you founded.
The MediaWiki wikis hosted on Wikia are called Wikia.
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To see a complete list of all Wikia, see the list of Wikia.