We can find a lot of fluctuation of wordforms in Japanese loan words. One of such examples is V sound in English, which is represented by 'b' and 'v' sounds in katakana notation. Using search engine for WWW, we can get hit counts, which is resumed to be numbers of frequencies of each wordform. The results showed that a number of loan words are represented by 'b' notation as established wordforms. But some words are fluctuated between 'b' and 'v' notations. They are (1)used in the field of music, (2)names of places and humans, (3)borrowed from non-English languages. We also found some wordforms with 'v' notation which stand for new meanings.

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