"Tanzanian and Kenyan"

Translation: Mtanzania na mkenya

[Zekae]

Would this be used in the context of ancestry? As in, I am both Tanzanian and Kenyan?

[Jonahmax14]

Yes. You could say "Mimi ni Mtanzania na mkenya" to say, "I am Tanzanian and Kenyan."

[AlDatGltrsIzGold]

It is just a statement. That is not acceptable to say I am both

[jmuhammad]

The letter "M" is placed before names of places, does it have any special meaning?

[Catriona28475]

Yes, it refers to a person from that country. And the prefix "wa-" refers to people from that country. So:
- Kenya
- mkenya (a Kenyan)
- wakenya (Kenyans)