Most TF names are gender neutral - e.g. Strongarm and Strongarm etc.
There's no inherent reason why Starscream, Hellwarp etc. can't be assigned to female characters as many of these are comprised of gender-neutral words. It's only really relevant when using gendered-names or words.

Having said that, "Ultra Magnus" is a contradiction in gender as 'ultra' is feminine while 'magnus' is masculine. Grammatically speaking it should either be "Ulter Magnus" (m.) or "Ultra Magna" (f.). Or maybe Magnus' original load-bearing little 'bot was female.