Mr Alhajali was a civil engineering student at West London University, the page said, with a dream to return home and "rebuild Syria".
The 23-year-old was following his brother Omar, who is alive and in hospital, but became overwhelmed by the smoke.
Harrowing stories have emerged of families separated as they fled the horror blaze and terrified residents saying their goodbyes over the phone as flames engulfed the building.
Omar, a business student, made it out of Grenfell Tower and is recovering from smoke inhalation in hospital.
It is likely that far more people perished in the horrific incident, but police have said it may prove impossible to identify everyone who lost their lives.
At least 17 people died when a fire ripped through the 24-storey residential tower block early on Wednesday morning.
He added: "Mohammed spoke to Omar and asked to put him through to mum".
"It's hard to believe Mohammed is now longer with us", Almashi said, adding that the brothers had planned to attend the campaign's Eid celebration marking the end of the holy month of Ramadan next week. I was watching the flat. "She said that she's waited four years to see him but then he died and I couldn't see him". It looks like it's been bombed, ironically like the burnt out shells of buildings in many war-ravaged and abandoned buildings in Syria where Mohammed Alhajali came from. "Goodbye, and tell my mom and my dad I love them.' And that was the last message", Almashi said. It was burning and my brother was inside.
He had not seen his family for five years and was forced to limit communication to avoid putting them in danger amid a crackdown against the opposition by Bashar Assad's regime, according to a family friend who launched the petition.
Britain's government has ordered checks at towers going through similar renovations, and some London neighborhood authorities said Thursday they'd do extra fire-safety assessments at public housing high-rises.
"It's been a real journey, tears shed, highs and lows, but mama, I'm an artist exhibiting at the Venice Biennale and the blessings are abundant!" she had written on Facebook.
"There were only around a dozen people there and I thought, "I need to do something on a bigger scale", so I went home and organised this". "I just sat there and thought, 'That could be me in there, ' " he said, "And what would anyone do to stop it?"