Genealogy / [ORIGIN] PAWLUK SURNAME PODLASKIE need some help [2]

hello

its about my gandmother
first of all :

i know :

shes born in poland at l (cross)uka in poldaskie vovoidship (today)
why i know

in the certificat of birth of my father is make a state of a city in luka with the l(cross) in poland in 1937 (my father is born in aout 1937( FRANCE ) )

the other name of l(cross)uka mentioned in 1937 in prussia does not look match with this
cf : (wikipedia) : en.wikipedia.org/wiki/Luka

is name is anastastie pawluk

i want know :
i am too young and i do not know my grandmother

many of my research mentioned that than pawluk was a rusyn lastname or ukrainian last name it is true maybe lemko ?
where can i find ?

my father tell me a state have part a minorities religious is the regions specified have a minorities people ?

where can find if i have still a family over there ?

what is the language do you advise to learn for improve my research ?

where can improve my research (in generally) ?

if you want more please answer me ;)

still sorry ! for my bad english i do not practice english often
i can explain many more but in french language

have a good sunday :)

michael