What is the word 'zarakai' when translated from Japanese to English?

If you mean 'Zaraki', surname of the 11th division in Bleach, it's just a name consisting of 更 (kanji for being late, getting late and stay up late, etc) and 木 (kanji for tree).

Maybe it's referring to how he is always late, due to his 'bad sense of direction' and his 'playful little vice-capitain'.. :), or maybe could refer to his power only showing at the end, late in a fight.. late-blooming or something.