User blog comment:Gourgeist/What the hell?/@comment-35417358-20160627235348/@comment-27441457-20160628001118

That can't be the case. Their raw names are エレン・イェーガー (Eren Yēgā) and アルミン・アルレルト (Arumin Arureruto)

Based on the archived version of the page found here (https://en.wikipedia.org/w/index.php?title=List_of_Attack_on_Titan_characters&direction=next&oldid=594207544) it looks like it might've just been vandalism from an anonymous editor.