Was culitho ever a "word in the English language"? Anyways, if it's just about finding a trademark-able sequence of letters that can be done with the restricted latin alphabet used in the English language and keyboard, then there would still be the option of doing what nVidia did in their company name and add an n in front of another consonant, for example:

nCuLitho … I wonder how Spanish-speaking people would like that one. Or maybe that added letter makes it too long anyways and it could be shortened to… nCuLo