TS

[…] a beautiful, internationally based folk etymology in Transylvanian Saxon: the French formula de haute volée, "of high rank" […] became Håt-voll-lei, literally "hat full of lei" ( = "rich person") in the TS popular usage.

[…]

The Romanian family name […] is Radu, to which the TS feminine marker -an (HG -in) is attached.