Final output comming as Account and Opportunity ID. i want to display Account name and opportunity names

public class Map_Opportunities {
    public Map<string,List<Opportunity>> oppMap        {set;get;}
    public List<Opportunity> optyList                {set;get;}
    
    public Map_Opportunities(){
        oppMap = new Map<string,List<Opportunity>>();  
        
        for (Account acc: [SELECT name,(SELECT Name FROM Opportunities)FROM Account]){            
            oppMap.put(acc.Name,acc.Opportunities);            
        }        
    }
}
///VF
<apex:page controller="Map_Opportunities">
    <apex:form >
        <apex:pageBlock title="Account Map">
            <apex:pageBlockButtons location="Bottom" style="opportunity">                
            </apex:pageBlockButtons>
            <apex:pageBlockSection columns="1" collapsible="false" >
                <apex:pageBlockTable value="{!oppMap}" var="m">
                    <apex:column value="{!m}" headerValue="Account Name"/>
                    <apex:column value="{!oppMap[m]}" headerValue="Opportunity Name"/>
                </apex:pageBlockTable>                
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>
</apex:page>