Lilian is also Estonian (used alongside Eliisabet, Elo, Liis, Liisa, Liisi, and Liisu in Estonia) Polish (used alongside Elżbieta, Ela, Eliza, Izabela, Izabella, Iza, Liliana, and Lilianna in Poland) and Swedish (used alongside Elisabet, Elisabeth, Elise, Ella, Elsa, Elsie, Lis, Lisa, Lisbet, Lise, Isabella, and Lilly in Sweden). The name day for Lilian in Estonia is May 20. The name day for Lilian in Poland is February 14. The name day for Lilian in Sweden is September 6.
"Lilian" is the typical form used in the UK. "Lillian" is the typical version used in the USA.The name does have a nice, understated elegance to it. And no need for fancy-shmansy pronunciations: "LIL-ee-un" will do just fine! ;-D.