Translation:I call their names, i.e. Tono and Andi.
oh no, i've definitely heard it. i'm one of those who does say it out loud.
It means "that is...". You'd say it before clarifying a statement, but it's used more in writing than spoken dialogue. Here's an example I found on Wiktionary:
"The three U.S. states on the west coast (i.e., Washington, Oregon, and California) have mild seasonal variations in temperature (i.e., warm winters and cool summers)."
I.e. stands for the Latin id est = in other words. I agree with cafe_disco that it is used more frequently in written English. E.g. on the other hand means exempli gratia = for example.