No it is English. The exact origin of the word is unknown but it was maintained throughout the 19th century by those that felt Latin was the 'right' or 'proper' way to speak.
burrito e.g i was incognito in Mexico while eating a burrito ^_^
unknown, isolated, unrecognized, hidden, anonymous
1. Earth Wind and Fire2. Rotary Connection3. Sergio Mendes4. Stevie Wonder5. Chic
meaning of incognito is: being in disguise or blended in Hidden, or undetected also without revealing ones true identity.