Name of this position?

Names of sexual positions tend to change according to sources.

In the case of this position, some sources call it doggystyle or doggy-style oral. Those same names seem to apply for a rimjob, a blowjob or a cunnilingus given in this position. Sources:
https://beducated.com/mag/oral-sex-positions/
https://www.mindbodygreen.com/articles/oral-sex-positions
https://uk.askmen.com/sex/sex_positions/the-best-sex-positions-you-should-try-tonight/doggy-style-oral.html
https://www.mindbodygreen.com/articles/oral-sex-positions

It is also called "doggy blowjob" according to other sources. This appellation seems to lead mainly to gay stuff, which is not my cup of tea, but if you like it, go for it. However, be careful because this appellation may also lead you to unwanted zoophilia links... Example of a site referring to the position as "doggy blowjob":
https://gaysexpositions.guide/doggy-blowjob/

On some websites they call it "backward blowjob" or "reverse blowjob" :
https://www.xvideos.com/video49528963/reverse_blowjob
https://www.pornhub.com/view_video.php?viewkey=ph558e8f0ba0adc
https://www.pornhub.com/view_video.php?viewkey=ph60da2b118e75d
https://www.pornhub.com/view_video.php?viewkey=ph5fa35da62369e

You can also find sites or videos where they call it "blowjob from behind", "blowjob from the back", "sucking from the back", "sucking dicks from the back", etc., which sound more informal to me, but might help you find what you are looking for. Examples:
https://www.xvideos.com/video53938685/chubby_girlfriend_gives_boyfriend_blowjob_from_behind_while_playing_with_his_ass_hole_live
https://www.pornhub.com/view_video.php?viewkey=ph5df330f96fd43
https://www.pornhub.com/view_video.php?viewkey=ph5ae37d37d225b
https://www.pornhub.com/view_video.php?viewkey=ph5f8525cb09fec
https://www.pornhub.com/view_video.php?viewkey=ph607462fc976b5
https://www.pornhub.com/view_video.php?viewkey=ph5f9ec020d1033
https://diskretadultlife.com/blow-job-positions/

In case someone wonder who is on your GIF and where it comes from: the transsexual is Vixxen Goddess (aka Alexandra Petrova, Kasha and Petra Petrova), the guy is Robert Axel and the scene is called Vixxen Goddess Fucks a Big Black Stud in Her Lacy Lingerie and is from TS Playground 18.

Proofs:

https://www.adultdvdempire.com/1737756/ts-playground-18-porn-movies.html

https://www.tsplayground.com/en/video/TS-Playground-18/75451

Links to the video:
https://www.shemalestube.com/de/video/sexy-brunette-got-a-huge-bareback-surprise/playlist/376/
https://www.shemalestube.com/video/alluring-brunette-tight-ass-fuck-bareback/playlist/1257/
https://www.shemalestube.com/de/video/vixxen-and-robert-s-interracial-tranny-fuck-/

Names of sexual positions tend to change according to sources.

In the case of this position, some sources call it doggystyle or doggy-style oral. Those same names seem to apply for a rimjob, a blowjob or a cunnilingus given in this position. Sources:
https://beducated.com/mag/oral-sex-positions/
https://www.mindbodygreen.com/articles/oral-sex-positions
https://uk.askmen.com/sex/sex_positions/the-best-sex-positions-you-should-try-tonight/doggy-style-oral.html
https://www.mindbodygreen.com/articles/oral-sex-positions

It is also called "doggy blowjob" according to other sources. This appellation seems to lead mainly to gay stuff, which is not my cup of tea, but if you like it, go for it. However, be careful because this appellation may also lead you to unwanted zoophilia links... Example of a site referring to the position as "doggy blowjob":
https://gaysexpositions.guide/doggy-blowjob/

On some websites they call it "backward blowjob" or "reverse blowjob" :
https://www.xvideos.com/video49528963/reverse_blowjob
https://www.pornhub.com/view_video.php?viewkey=ph558e8f0ba0adc
https://www.pornhub.com/view_video.php?viewkey=ph60da2b118e75d
https://www.pornhub.com/view_video.php?viewkey=ph5fa35da62369e

You can also find sites or videos where they call it "blowjob from behind", "blowjob from the back", "sucking from the back", "sucking dicks from the back", etc., which sound more informal to me, but might help you find what you are looking for. Examples:
https://www.xvideos.com/video53938685/chubby_girlfriend_gives_boyfriend_blowjob_from_behind_while_playing_with_his_ass_hole_live
https://www.pornhub.com/view_video.php?viewkey=ph5df330f96fd43
https://www.pornhub.com/view_video.php?viewkey=ph5ae37d37d225b
https://www.pornhub.com/view_video.php?viewkey=ph5f8525cb09fec
https://www.pornhub.com/view_video.php?viewkey=ph607462fc976b5
https://www.pornhub.com/view_video.php?viewkey=ph5f9ec020d1033
https://diskretadultlife.com/blow-job-positions/

In case someone wonder who is on your GIF and where it comes from: the transsexual is Vixxen Goddess (aka Alexandra Petrova, Kasha and Petra Petrova), the guy is Robert Axel and the scene is called Vixxen Goddess Fucks a Big Black Stud in Her Lacy Lingerie and is from TS Playground 18.

Proofs:

https://www.adultdvdempire.com/1737756/ts-playground-18-porn-movies.html

https://www.tsplayground.com/en/video/TS-Playground-18/75451

Links to the video:
https://www.shemalestube.com/de/video/sexy-brunette-got-a-huge-bareback-surprise/playlist/376/
https://www.shemalestube.com/video/alluring-brunette-tight-ass-fuck-bareback/playlist/1257/
https://www.shemalestube.com/de/video/vixxen-and-robert-s-interracial-tranny-fuck-/