You might want to start by looking at common last names for a region you identify with.
e.g. here's a list of common surnames in England/Wales (Picked because I'm British myself)
If I had to pick from that particular list, I might go with:
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Valentine Yates
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Valentine May
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Valentine Frost
(also several borderline puns such as Valentine Hart, Valentine Rose, Valentine Day)
e: Oh also, I honestly didn't think my full name flowed very well initially. But I got used to it over time!
I guess I'm kind of confused -- by "on here" do you mean in this community, on blahaj.zone, or just on lemmy in general?
(I have not run into transphobia in any of those places, but I stick to a pretty small set of communities)