I am not sure why it has been given that title but the word Americanah comes from the word Nigerians use to describe those who have left the country for the US and have become “Americanized” in which way, they speak the language and live the life they watch others do.
A book review by The Book Case has stated that Adichie’s heroine Ifemelu is surprised to find the term applied to her when she returns home after 15 years in the US. Especially since she’s always felt ambivalent about America: the country not only separated her from her teenaged love, Obinze, who had his visa denied, it also made her truly conscious of race for the first time. But upon her return, she and Obinze are reunited and must see how their very different expatriate pasts affect both their relationship and their lives in a newly independent Nigeria.
Interesting… Adichie never writes except its worth it