Unarmed Mr Palmer was stabbed as the marauding attacker rushed through the gates to the Palace of Westminster.
Despite the efforts of paramedics and Foreign Office minister Tobias Ellwood to save the 48-year-old, he died in the shadow of the building he was dedicated to protecting.
Brendan Cox, whose wife was stabbed and shot by a right-wing extremist outside her constituency office last June, said the identity of the suspected terrorist was irrelevant.
Sharing a picture of Mr Palmer on his Twitter feed, he wrote: "I don't care about the name of the attacker.
"This is the name I will remember."
Mr Cox earlier said the assault on the country's political nerve centre would "not succeed in dividing us".
Neo-Nazi Thomas Mair received a whole-life sentence for the assassination of the Batley and Spen MP days before the EU Referendum last summer.
In a statement delivered to the OId Bailey following her killer's conviction, he did not address him by name, saying: "We have no interest in the perpetrator. We feel nothing but pity for him."
Police in West Yorkshire ramp up patrols in wake of Westminster terror outrageYP Comment: Why Britain will always stand firm against terror – direct attack on democracy"Screams of 'stay back' as panic set in": Yorkshire Post reporter Kate Langston caught up in London terror attackLondon attack: Tributes pour in for murdered PCLondon attack: Five dead and policeman stabbed as knifeman brings terror to WestminsterLeeds MP: ‘Democracy endures and prevails over these sickening attacks on it’Wakefield MP Mary Creagh shuts down tube station after terror attackHow the tragedy unfolded: Attack outside Parliament in London