• Hanukkah : 11,300,000 hits.
• Chanukah : 2,930,000 hits.
• Hannukah : 867,000 hits.
• Hanukah : 556,000 hits.
• Hanuka : 357,000 hits.
• Chanukkah : 231,000 hits.
• Chanuka : 293,000 hits.
• Channukah : 131,000 hits.
• Chanukka : 108,000 hits.
• Hannukkah : 54,700 hits.
• Januka : 33,700 hits.
• Hanukka : 31,400 hits.
• Channuka : 14,700 hits.
• Hannuka : 12,500 hits.
• Hannukka : 7,870 hits.
• Channukkah : 6,050 hits.
• Xanuka : 2,520 hits.
• Channukka : 2,040 hits.
• Janukah : 394 hits.
• Janukkah : 215 hits.
• Chanuqa : 120 hits.

This is the 2008 update compiling Google search results for 22 variations on the spelling of Hanukkah. This year, by request, I added three variations based on Spanish spellings starting with the letter J.

Previous years: 2004, 2005, 2006, 2007. 2004 numbers thanks to Jeremy Blachman

Current Google Trends snapshot of the top 5 spellings:

How Do You Spell Channukkahh by the Leevees