Neither one of mine were on that site. The closest to Mishi was Misha, which is Michael in Russian. The closest to Mitzi was Mitsu which means Light in Japanese. LOL! Mitzi is anything BUT light, my beautiful Plush gal!
Now "officially" Mishi is short for Mishigaas (his full name given to him by his Jewish foster mom) which came from the fact that he is mishugenah (sp?) - my beloved cuckoo kitty.
Mitzi is named for her little white mitts.
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