Tiny is quite a tiny word, you could, I guess extend it to tinier and tininess, but it is basically quite a small word and although it comes from Middle English, tine, no-one seems sure where it came from before that. Is it associated with the word tine, a prong of a fork? The two words arrived at a similar time; the fork meaning comes from Old German, tint, meaning point or spike, which may have a common root with Old Norse word, tindr.
Or could it, just could it, come from the Irish Gaelic, tanaí which means thin or slim? Who really knows, but certainly words are lent and borrowed both ways when languages meet, and the connection between peoples living in Ireland and in mainland Britain are ancient!
Lois Elsden 