We'll search for every combination of “Rowan” and your other names.
*ROW
R*WWN
RO*WWN
RW*WAN
R*WNN
RO*AAN
RO*OWN
RO*ANN
RO*NNN
RR*WAN
RR*ANN
RO*WNN
RR*AAN
RR*NNN
R*NNN
RW*NNN
RW*AAN
R*OWN
RR*OWN
RW*ANN