Eric Dane‘s GoFundMe is being questioned by some cynics … but its purpose is more than needed, TMZ is told.

Here’s the deal … the beloved “Grey’s Anatomy” star died last week at the age of 53 … and shortly after, a GoFundMe began to benefit his two teenage daughters. But, as happened when James Van Der Beek passed — some questioned why a Hollywood actor would need the cash.

A source close to the family tells TMZ … Eric faced substantial medical bills during his battle with ALS — and the fund was started by friends to help his children … no one has to donate. So far, more than $355K has been raised.

Our source points out … some donations have been $5 or $10, so people clearly understand the purpose — and just want to help. Of course, there have also been substantial donations … dropped by Hailey Bieber and “Euphoria” creator Sam Levinson — who both separately gave at least $20K.

TMZ is also told … Eric was single when he passed … and had been prior to the holidays. His only focus was on his daughters and one-time estranged wife, Rebecca Gayheart. His ex-girlfriend also posted a tribute mourning his death.