I found a list of names of the 2018 stabbings. I assume, half of them sounding muslim could be my imagination.
Yes it is your imagination. The actual figure is around 20%. It's actually the lowest figure apart from two Spanish names.
I posted a link to their photos a few days ago, they are the victims but we can assume the perpetrators had a similar racial breakdown.
On the list you linked to I counted out of the 35:
9/35 were of obvious African origin
7/35 were of obvious 'Muslim' origin
2/35 were of obvious Spanish origin
10 sounded British of, either black or white origin.
The others either weren't named or sounded vaguely foreign but not of 'Muslim' origin. I put Muslim in quotes because Muslims are of many nationalities.
Having lived in London, I can tell you that the neighbourhoods where these attacks took place are all,with the exception of Kensington, places that have historically been considered rough and dodgy, at best very mixed, with the crimes being shared between the black and white youth, blacks maybe a somewhat higher proportion. As property has become unaffordable in nicer parts of London, these areas have become gentrified and more upwardly mobile types have moved in, but the 'local' vibe is still there. Teenagers having their gold chain snatched from round their neck by a gang of their peers was common in Walthamstow or Lewisham thirty years ago, now it's stabbing. It has nothing whatsoever to do with 'Muslims'. Most of this kind of crime is associated with low income but more importantly low aspirations, socially disadvantaged communities.
Muslims in the UK are no more violent or dangerous than any other group, except when they're religious maniacs. Thankfully those are in the minority.