According to About.com, "asante" means "thank you" in Swahili. This Bantu language is also known as Kiswahili, and people speak it in many parts of east Africa, especially near the coast.
Swahili is a major language that has significant communities of speakers in Kenya, Tanzania, Burundi, Mozambique, Oman, Somalia, South Africa and Uganda, according to Ethnologue. These speakers often use Swahili as a lingua franca to communicate with people with different native languages, but some speakers use it as their first language. Swahili is at root an African language of the Niger-Congo family, but it developed through coastal interactions with Arabic traders. Therefore, it has a number of Arabic loan words, and the name of the language itself comes from an Arabic word "saw??il?," which means "of the coast."