Combination of...

Arne doesn't really look like Albert Gerrit to me, and I don't find it a very nice name, a bit bland, sorry!
Gert might be an option, although I don't think it's a very tough name.
Gerben doesn't really fit either, but I do find it a nicer name.
Bart fits in better and I think it's a nice name too.
Besides Bart, you could also go for Bert, although I find that name less nice.
A cousin of mine is called Brett, maybe that's something?
Berend/Barend (and if you just want to use the letters of the names, Berent/Barent)

Otherwise, I can't think of anything else.
I hope you find it helpful!

Gabi, Ar(r)e, Art, Gert, Geer, Geert, Bert, Beer, Berri(e), Arent.

Plenty of ideas, and I only added an N to Arent; the rest are just from the letters in those two names.

Good luck!

By combinations I mean a combination of the names Albert and Gerrit. It's not a name, but Alrit would be an example of a combo. Feel free to get a bit more creative if you like! ;-)

Thank you!

Thank you!