Okay, I'm not good at Japanese but I can read kana.

"Fu-ru-ta-ka-e-ru"

What the heck does Eru mean here?

Mobiusdiablo said:

Okay, I'm not good at Japanese but I can read kana.

"Fu-ru-ta-ka-e-ru"

What the heck does Eru mean here?

I'd interpret that as the usual suffix for angel names (in this particular case, Furutakael), given the sketched wings on her back.

Mobiusdiablo said:

Okay, I'm not good at Japanese but I can read kana.

"Fu-ru-ta-ka-e-ru"

What the heck does Eru mean here?

It's a portmanteau - 'Kaeru' is an imperative for 'return'.

Probably closer to a word play.

Furutaka + Kaeru (return/come home).