Check out the Nigerian languages that are widely spoken around the world.
Due to many reasons — trans-atlantic slave trade, cattle grazing, immigration — small communities have grown in other countries where some Nigerian languages are actually spoken.
The Hausa are the largest ethnic group in West Africa with native speakers higher than any other language in sub-Saharan Africa, estimated at 22 million. They are originally from Hausaland in Nigeria, straddling the border between Nigeria and Niger. The Hausa people are nomadic in nature and began settling in the Northeastern part of Ghana over 500 years ago. However, due to trade expansions in the 18th century and the Fulani holy wars in the 19th century, the rate of immigration increased. Soon enough, a Hausa community began in Ghana. The Hausa of Ghana are virtually all Muslim so the mannerisms and cultures of Islam is common in their community. Their presence in the Northeastern part of Ghana (and northern Cameroon) is emphasised by the radio broadcasts in Hausa to cater to the Hausa speakers. If you have a knowledge of Hausa and find yourself in that area, it will help to make the locals warm up to you. Here's all you need to know about a trip from Nigeria to Ghana.
The Igbo people are one of the largest ethnic groups in Africa as native speakers are estimated at 24 million. In Equatorial Guinea, Igbo is recognised as a minority tribe with about 53,000 speakers. In Cameroon however, there are an estimated 105,000 Igbo speakers in the country. The Igbo "Red Eboe" people were also a huge part of the formation of Jamaica and its language due the large influx of Igbo Slaves during the slave trade. Hence, you are very likely to find the Red Igbos of Jamaica. Since most of Equatorial Guinea speak Spanish, maybe a knowledge of Igbo will help you navigate the country.
Though one of the most widespread languages, it has 20 million estimated speakers across Africa, according to Buzz Nigeria. Outside Nigeria, you can find large yoruba-speaking communities in Togo and Benin Republic. Smaller communities can be found in Sierra Leone, Liberia and other African countries. However, due to slave trade, non-vernacular parts of the language remain in Brazil and the Caribbean Islands. It was even a huge part of creating Jamaican Patois language. In Benin and Togo, French is the lingua-franca but perchance you can't speak it, Yoruba is your next best option. Here is the ultimate food guide to visiting Benin Republic.