They don't have a "new" family name. Although it's rarely mentioned on the show, Cosmo's last name is Cosma so that's still their family name.
. . . OddParents .
In the television programme, yes. In real life, no.
The Fairly OddParents - 2001 Cosmo Con Wanda's Day Off 2-15 was released on: USA: 10 January 2003
No. They won't introduce another baby character on the show.
Trixie Tan does appear in the Fairly Oddparents episode Finding Emo, along with Tinny, Cosmo, Wanda, and Poof.
Cosmo and Wanda live in the fishbowl to protect their identitys
Cosmo and Wanda are fictitious characters, of course. But fairies are said to exist, maybe not the kind who grant wishes on Earth.
Susanne Blakeslee
Timmy first got Cosmo and Wanda in Season 0 (Oh Yeah! Cartoons) in the episode called "The Fairly Oddparents!" Hope this helped :)
Their full names are Wanda Venus Fairywinkle and Cosmo Cosma. Hope this helped.
Of course not, what an absurd question. The Fairly OddParents is a children's cartoon, they would never tackle an issue of bisexuality.
If you are referring to cosmo and wanda from fairly odd parents, they are two fairies that are married to one another.